youd be very hard to fit a E6600 and an 8800gts in the same budget. Heres a trick though, but not really.
Buy a C2D
Buy a well overclockable Mobo such as the DS3, P5B Duluxe or P5B-E.
Get DDR2-800 RAM
get aftermarket fan.
OC that puppy to BLAZING fast speeds.
OC isnt really all that hard and is much safer as opposed to 6 or 7 years ago when parts would blow up. if you were to buy a Core 2 Duo and not OC it I probably would laugh unless your other parts didint alow it. Then i would say shame on you for not picking parts to make your C2D a tad OC'able.
E6300 w/ Arctic Freezer Pro 7 @ 3.6ghz 1.4Vcore
Antec 900 Case
EVGA 750i FTW Mobo
4x1GB of G.skill DDR2-800
2 8800GT in SLI
22" Samsung Syncmaster
1 250GB WD and 1 Seagate 7200.10 in RAID 0
Corsair 520HX 3DMark06 Score: 13900