The Romisen RC-T6 is probably nudging 500 lumens on high. http://www.dealextreme.com/details.dx/sku.15686
Some of the 2 x 18650 lights would be worth a look. http://www.dealextreme.com/details.dx/sku.18071 comes to mind.
But 5-700 lumens is probably your lot unless you want to modify something yourself.
There are some beamshots here of the brighter lights I own. All of these are budget lights except the Fenix. Most of them, I've had for a while but I'm not aware of much that's brighter for not too much money. Note that these beamshots are NOT comparable to my usual ones as the test range is rather more reflective than usual
DX has a few lights running the Luminus SST-50 emitter that could be capable of a lot of light if driven hard, but their stock drivers don't
Aurora SH-45 - http://www.dealextreme.com/details.dx/sku.33618
Aurora SH-44 - http://www.dealextreme.com/details.dx/sku.33619
Aurora SH-43 - http://www.dealextreme.com/details.dx/sku.33617
Aurora SH-42 - http://www.dealextreme.com/details.dx/sku.33616
Aurora SH-40 - http://www.dealextreme.com/details.dx/sku.33615
This one claims 1200 lumens but that will be right!! Even at 800 it is still pumping out a lot of light but look for Romisen RC-T6 beamshots, the beam will be like that, but brighter. That is, assuming they can actually get them from the factory - I've just cancelled an order for one after three months of no stock - I strongly suspect they only ever had a test batch and the factory decided they were uneconomic to produce at that price. I ordered one the day DX announced it.
There's a review here of an other large 600 lumen light.
There are alternatives.
Get a 2 D Maglite
Get two of these lithium ion D cells (Assuming you already have a charger that can charge lithium batteries) from Kaidomain. $34 These cells do need to be treated with respect and recharged when the light starts to dim.
Get one of these shortened springs - the standard Mag spring is too long for this purpose $4
The bulb we are going to use runs way hotter than the Maglite one and will melt the plastic lens and reflector.
So we get a KD smooth metal reflector for most throw and an ugly beam $13
Or an orange peel one for a prettier but less throwy beam $15
We are up to $53 assuming the more expensive reflector
Get a glass lens KD's fancy coated one for $6 or be a cheapskate like me and get 5 uncoated ones for $3 from DX We've now spent $51-59
Then drop ten dollars on a pair of ROP bulbs which Lighthound are out of just now. These are a 24W and an 11W bulb which are being a bit overdriven by the two lithium cells. the H bulb is the high power one and has a pointy top. It will run for an hour on these cells and give over 1000 lumens up to maybe 1200-1300 if you start fixing resistance and generally shortening the life of the bulb - which is not a long time to start with.You'll get around two hours on the low bulb.
Under $70 that's the most light you are going to get at present.
Anyone who knows better, please feel free to correct me.