Ok, got some good advice from here and elsewhere, so here is my 2nd attempt.
I realized I didn't have to buy Windows again. I have a copy I can use, so I used the money to upgrade to 2 gigs of RAM. I also took the DFI mobo instead of the ASUS. I switched to an EVGA 128MB 6600GT over a ASUS 256MB 6600. A lot of people said that was a good move... can someone explain why?
The DFI board only has 4 SATA slots, but I guess that's ok. Right now I'll only have the DVD Burner and a HD hooked up to it. Maybe another HD in the future.
Also, if there's anything I'm forgetting, or if you have any specific reccomendations about a case, let me know.