Just my 2 cents here – Unless you are really familiar with building newer PC’s – I’d go with a Dell or Boxx computer built to order. I say this only because I built one last year and it was a nightmare. The new Intel processors are hotter and a lot more complicated and sticky – I mean this literally, heat sink goo – and my experience was it never cooled right or ran right. I ended-up buying a Dell XPS Dual Core with 4 Gigs of RAM and I’ve been very happy with it, and it cost about $2K less than the one I built! Also – ditto what’s been said about Vista – stick with XP. Good Luck!
-Cathy