You'd probably want to get a cheaper
CPU (3570k for $215 "Additional $15 off w/ promo code BTS504, ends 8/2 ") and a more expensive
GPU (gtx 680 for $490 "$35 off with promo code HARDOCPX725B, ends 7/31 ").
Assuming you want to keep around the same budget, of course. MOST LIKELY going to result in higher PS2 performance for cheaper, assuming you buy them while there promo codes are good. Even if you wait until the promo codes are done, it's still a better route.