Originally posted by: Cheex
I'd suggest that you consider buying a single 1GB stick (sacrifice Dual Channel (for now)) so that you can add another 1GB later to have 2GB (2x1GB). That's what I would do.
I would suggest doing exactly that, also. Get one good 1GB stick now, then get another in 6 weeks or so, when memory prices start coming back down.
You could even spend ~$200 on 2x1GB sticks now, and just use the Intel heatsink, until you had the money for a better heatsink. It would only cost ~$20-30 more than what you're planning on ordering now, plus a $50-60 heatsink.
edit: That power supply should be fine with a 7600GT, but it will need to be replaced before adding a better, faster video card.