Either is fine for 10x4 resolution. Once you get to 12x10 and above the 256MB 8800GT often tanks bad so the 8800GS is better. Both can hurt once res goes way up though.
I have both 8800GS cards and the evga is the way to go. Quieter variable speed cooler on it. Go for it it's amazing for the price. Make sure it fits in your case (9 inches long + room for the PCI-e power plug) and you have an addequate PSU.
BTW, what are your system specs? CPU, power supply and current video card? See at 10x7 res or lower, you will very often be CPU limited with these cards anyway as that res just doesn't stress these cards. It's not going to hurt your gaming, just means for sure do not go higher than the 8800GS. I won't say go lower either as there is a significant performance drop going under $100. The 8800GS really is where things start to get serious as the HD2600XT and 8600GTS are miles behind. But from my own testing of an 8800GS in a dual core X2 4200+ rig, I am typically CPU limited at 10x7 and 4xaa in the games I have tested. it will be the rare exception game to be GPU limited at 10x7.
But if you have a slower single core CPU, you may find it preventing the 8800GS from outpacing your current card at 10x7 resolution. Just trying to help you not be disappointed, so let us know your specs.