I agree with what Quikkill is saying. If you can, scrounge up $350 total so you can invest in an i5-3570k instead of a dual core. Otherwise your graphics card and cpu are pretty solid.
Are you kidding me that Phenom is bottlenecking the 7850
It gets 5% better performance than my C2D E6550 (AT STOCK SPEEEEDS)
http://www.anandtech.com/bench/Product/289?vs=24 look at the improvement with the proc you mentioned, slightly diferent models but only clock speeds
If you can get an even better cpu than the i3, you'll get more out of your 7850
(okay those benches are just to give you an idea you didn't specify the phenom model)