You know, with $600, you can build a pretty darn good PC!
$80 for the motherboard
$150 for a fast Athlon 64 processor (better for games apparently)
$50 for a cheapo case and power supply
$200 for a pretty good video card
$50 for memory
$50 hard drive
Steal a keyboard and mouse
Monitor not included, but neither is one included with the XBOX.
Of course, you can upgrade to higher cost parts, but it's all about the video card. $400 buys you an amazing one.
PC games are, in my opinion, way better than XBOX games (due to the sheer number of them!) BUT the XBOX games are GUARANTEED to run and look nice on your xbox. Not so with PCs.
With $3000, you not only can build an awesome PC, but have an amazing monitor as well. But I guess if Little Paris Hilton wants an xbox, then her daddy will pay any amount to make sure she gets one...
V