Originally Posted by Duo_Maxwell
No limit! GTX 690, there problem solved....
Honestly though I'd say go with Radeon HD 7850 prices have come down in the past few months on them and he gets 2 free games right now. If he playns on gaming at say 1080p at very high or better settings (like you'd use if gaming on a big TV or high res monitor) then he would probably be best with a GTX 660 or Radeon 7870. Anything more and I'd say the processor will bottle neck the GPU's power.
Speaking of processors, depending on the types of games he's playing he may consider trying the PC first without dedicated graphics. You'd be surprised at what the embedded graphics (7660D) of that A10-series processor can do. He won't be gaming with much of anything at 1080p or maxing out Crysis, but most folks agree the new Trinity A-series can play games that are not super intensive (like Diablo 3 for example) at acceptable framerates with the pretty good settings.
Note that if he gets a good dedicated GPU, like someone else said above, he will absolutely have to set aside at least $50+ to upgrade to a decent PSU. He will probably want something with at least 450-500 watts...
He has been playing around with games like WoW, so he is okay for the moment. But he surely will be playing heavy graphical games. So far, from you and others here I was thinking that the Raedeon HD 7870 would be nice, since it's comparable to 7900 series from the reviews. So what version of that should I look into. There's a Myst Edition, but only has one fan compared to others.