I'm getting ready to build a new system and I wanted to know if anyone foresees any problems with what I'm getting ready to put in it. I was given an ECS nFORCE4-A939 mobo to start with. I'm wanting to put in a 120 gig Seagate SerialATA 150, 1GB (2x512) of Corsair ValueRAM, EVGA 7800GT/GTX PCI-e vid card, and an AMD 64 3500+. With my current hardware I'm running a 420W Thermaltake PS. When I upgrade with the aformentioned parts, is it possible that I may need to upgrade my PS as well? I'm kind of unsure about that ValueRAM, too. Any comments, suggestions, advice....anyone? Thanks.