Dell makes a nice lookin box but its resellerratings.com rating of 3.32 oughta chase most people away.....buying alienware isn't going to help with all of their BBB problems. WidowPC provides a nice option with good resellerratings.com scores but at $4400 - $4700, these things just don't have the same bang for the buck.
You can easily get the same thing .... Core Duo 2.16, GeForce 7900 Go, etc etc, over at ProStar.com for at least a grand less. Look closely at the ProStar 5724 and the WidowPC 517D and then figure out who's buying what from who :? .
I have a 5724 (2600, 2 Gigs, 7200 SATA, GeForce 7900, 1920 x 1200, TV Tuner, DL burner, BT, XPPro, etc) and it beats the Dell's score by about 250 in 3DMark 2003, about 8 in 3DMark2005....for about $1400 less.