Welcome to the Overclock.net forums!!!
I see you have a very fast rig, lets make it faster!
Since you have an ATI video card, I would recommend using
ATI Tool to overclock your card. This program not only lets you overclock, but it lets you monitor GFX card temp(some models) and test for artifacts(what you get when you overclock too much). I am pretty sure you card has adequate cooling, so you can get a fairly good overclock. Be sure to benchmark you card before and after the overclock with 3dmark03 and\\or 05. Good luck, and welcome to the Overclock.net community!!!