If you like to overclock, you might want to look into the E4300, it's a lot cheaper and has a 9x Multiplier, so just to get your ram to run at DDR2-800 you'll have 3.6Ghz. So get a good cooler with the E4300, and you'll have that baby flying in no time.
EDIT: I don't know when the 8900GTS/GTX is coming out so i don't know if it would be worth waiting for or not.