In all the times I’ve gone to the SF site I never saw that drop down box. Wow. I always hated it because I could never find what I was looking for. 
Anyway, I’ll have to look into those options I didn’t see before.
The 1000lumens is roughly what you get with 3amps to an XML2 on an aluminum star.
That Ultrafire 300lm is an sk68 clone; I think just about everyone here has a few of them (and if they don’t they need one!). 
They’re great little lights for $3-5.
Have you seen the big brother of the 18650 version you linked?
http://www.ebay.com/itm/290874165450