Like you, I have a 4 year old E6600 system and will be buying a new rig soon. Temps are rapidly rising on the cpu; I think the fan is unseated/not working but I don't care. My rig is going to be sans hd and vc then sitting on the curb in < 3 weeks. Anyway, like others have said, I don't understand why you'd want to waste the cash.
Unless it is an orgasmic life-changing better-than-sex experience for you to play Metro and Crysis at their highest possible settings, most games will be shredded with a 580 + 930-950/2500-2600 at 19x12. Even if you wanted to step up to 25x16, that list doesn't get much larger.
In fact, I'll probably be getting a 2500 and keeping my 285 until Kepler (granted all I play is poker, SC2, and BF). If you do decide to go 25x16, even dual 570's would be more power than you'll need for 99% of games. Then you have Kepler coming in 8-9 months...
Save your money.