If you like the C8 form factor and are ready to shell out $5 more, go for the XinTD C8:
http://intl-outdoor.com/xintd-c8-v4-xml2-u2t6-18650-flashlight-p-308.html
You can choose various tints (i have the XM-L2 T4 5B1) and drivers without disco modes.
[edit]
Local reviews:
Old model Review: XinTD C8 (SC-82)
Latest model Review: XinTD C8 SC-82/V4 (3C neutral white)
welcome to BLF… my suggestion is to add few more dollars and get Convoy L4, you won’t be disappointed with this light.
it’s much better than regular C8 and mod it with simple resistor mod and you got yourself a nice thrower for the money.
beautiful design light and easy to carry too 
http://www.fasttech.com/products/0/10002364/1457700-convoy-l4-cree-xm-l2-u2-1a-4-mode-1000-lumen-led
+1. Mine is the 2.8amp version in 3C tint. Best bang for my buck IMHO
Try your luck with wallbuy’s lucky money event. You could potentially get that L4 for a cool $17 like several of us did last time thanks to some awesome folks with extra codes.
Otherwise a simple C8 with the 2 group configuration works well. I’ve used mine a good 10-15 hours, never had an issue accidentally switching into the 5 mode group. Heat may be an issue indoors, but outdoors on high in 40 - 70 *F weather with little to no wind it wasn’t an issue.
It depends on what is OP looking for. Nice thrower for the money or more general purpose light. If it’s the second option than L4 isn’t very good choice becauise med mode is way too bright.
Thanks very much for all the suggestions, they all have been very useful.
I’ve decided on 2 things: it will be a Convoy light and this time I will be buying from Fasttech. I’ve also narrowed it down to 4 possible options.
I will try to summarize, and please let me know if something is not correct.
(And pls don’t laugh, it’s a steep learning curve… 
)
Option1: C8 U2 1B 2800mA
http://www.fasttech.com/products/1601/10002364/1212403
=> This would be a good thrower with cool white light and relatively high output but short runtime. It would get quite warm (hot?) on high after a short time.
Option 2: M1 T6 3C 2100mA
http://www.fasttech.com/products/1601/10002364/1212404
=> This would be a good all-purpose light with better tint and higher runtime but moderate output. Great form factor (except for the crown bezel).
Option 3: M2 T6 3C 2100mA
http://www.fasttech.com/products/1601/10002364/1212501
=> Basically the same as the above, but with a smooth stainless bezel (which I’d prefer over the crown bezel of the M1) and probably a bit better finish (?). Are there any more differences? Is it worth the extra or I shouldn’t bother?
Option 4: L4 U2 1A
http://www.fasttech.com/products/1601/10002364/1457700
=> This seems like a lot of fun but not very practical for everyday use. A lot of throw and output, but short runtime (?). Maybe a bit too big even for bag carry.
So what do you all think? Is it more or less OK, or am I completely off again? 
I’m leaning towards option 2 (M1) because of its size and suitability for everyday purposes, but before I pull the trigger I’d need some opinions to push me over the fence or convince me of the merits of the M2 or one of the other options.
Thanks in advance.
I'd go with option 2 but change to the 2800mA driver. That light should handle 2.8A fine unless you want to leave it on high for a really long time!
-Garry
The M1 and M2 are not the same. The reviews for the M1 are consistently better. I seem to remember the M2 has a questionable heat path and the build was not considered to be as good.
Again, I would suggest ordering from Simon at Aliexpress over the Fasttech one, you can spec a 3 mode driver and a next gen XM-L2 emitter in neutral white and have a really great torch for twenty bucks.
Use the ‘contact’ button to make any requests, I’ve found him very easy to deal with.
The L4 is better quality compared to the C8 and has a few better than budget features (better thermal path through copper star, built in LED shelf, good springs, electronic switch). Iirc l4 doesn’t throw as well as a c8, and my L4 is also not as bright as my other c8’s either. The L4 feels really nice in your hand.
You’re pretty well spot on with your summaries. I can’t speak to the m2 or m1 with personal experience.
You really can’t go wrong with any of the 4 choices, but my pick would be the L4 for quality and an in between of brightness/current/runtime (around 2600ma).
@garrybunk
2,8A also means more heat (even though M1 can dissipate it) and brighter lower modes.
@gregs656
M1 also has bigger reflector than M2.
@unknown00101
L4 gives ~3A to the emitter. The other C8 you have is from Convoy? If not I can assure you that all Convoys are decent quality lights.
I would prefer to pay by PayPal, so unfortunately Aliexpress is not an option. 
Thanks for the heads-up on the M2 problems though!
The L4 (option 4) should perform about the same as the C8; probably a bit throwier though due to the smooth reflector. It would be an option if you really want a side-clicky switch. The C8 has the advantage of using standard parts though; you would need a special driver if you ever wanted to upgrade/modify the L4.
I say go with the C8! That's a good light, and still small enough to drop in a pocket. Get the other one if you really don't value throw though...
Sorry, worded that poorly. My convoy c8 pulls 2.8ma on the button, but my L4 is around 2.6 iirc (posted actual number somewhere… I’ll look it up). Despite L4 being xml2, copper star, and less resistance issues my L4 is not as bright as my convoy or tangsfire c8. I may have just got a slightly weaker than normal L4, idk.
That’s a shame.
What are you planning on using this for?
I plan to use it as a medium-duty EDC light. Nothing special, mainly general lighting tasks that my pocket light couldn’t handle (it gets hot after a short time on max, I use it with a 10440 cell). I don’t plan to pocket-carry it.
Oh, yes, and I plan to carry and use it because it’s supposed to be fun.
Trouble with a C8 is that it is heavy to carry if you don’t use it a lot. Maybe 200 lumens will do him.
When I want 200 lumens I use my Eiger…
Fasttech offer a lot of option but not XM-L2.
Get the Convoy C8 at Banggood
There is even a thread here talking about that.
Go with any Convoy that you like, I’d rather get a Convoy S2 or S6, at banggood again they have the 2 group driver (and firmware can be flashed but it’s another story), XM-L2 T6-4C (great tint). They’re still too big to be carried in a pocket (get the Tank007 E09 for that) but it’s great in a coat pocket. And the form factor is closer than your ultrafire that you wanted first.
Getting for a 8*7135 driver will be bright on high but it will get hot too, runtime on high is not an issue as it will be hot before you get low voltage warning.
But medium at 33 or 40% will be bright enough.
I don’t think you need much throw - C8 is a great format but I don’t think it’s what you need.
Here’s my M1 next to a Zebralight SC600 Mk2 L2 and a Olight S10 L2 -
Unless I had a need for a lot of throw or long runtimes, I don’t think I would go any bigger than the M1 for general purpose duties. If you just want a general purpose floody light (which it sounds like you do) then I think one of the tube lights like the S6 is more appropriate. You could also look at the Roche F6, or spend a bit more and get an Olight S20.
…are you sure? LOL!!!
Ok, i offered my suggestion, but now go on and further waste your money… 