How's your Dell or HP NLE machine working out?

We currently are using a "home built" NLE machine and it works fine for it's intended use (3.2ghz w/ HT, 2gb RAM, PremPro 1.51, etc)...However, we need to add an additional, highly reliable machine for a new 1 hr. show...I'm looking for good experiences with Dell or HP or Alienware or etc. machines and any helpful hints/tricks to be on the lookout for...We would like to stay with XP Pro and plan on loading PremPro 1.51 initially and then upgrading to CS3 later...We'll be editing DV only with no addin cards (Matrox and such)...The ability to lay a 1 hr. show to MiniDV without hiccups is the high priority here...I really appreciate your time and advice...