For 700$ your not going to be able to play Crysis 2 on high, A 7850 wont cut it either a 670 is the lowest card that would cut it and that is 400$ alone. But for 700$ you can get a Low end I5 and a 7850 and be able to play the games on high with 1 monitor. and medium with 2.
I never said I'd be using both monitors for gaming, I use them both for music production software. And I'm thinking if I go with a 7850 or better I might just change to an a10-5800k build so I can crossfire it. And at only $130, I can put a little more into the gpu.