I've built my last few gaming PCs, but through work we just got offered XPS 700s at a pretty huge discount.
So, I'm looking at getting:
XP Pro
Dual Core 6300
2 Gigs RAM
2 250 Raid 0 HDDs
7900 GS
CD/neat case/cheap Dell Mobo/etc
750 Watt power supply
For a grand... I'm debating nabbing this and putting an 8800 GTS in it for gaming goodness. I'm sure it wouldn't be as fast as if I went through Newegg, but man with the 8800 GTS its still under 1450 for me...
Now, I don't keep up with PCs like I used to, and haven't bought a Dell forever, but is there any glaring reason I shouldn't do this?