So I went to that site and customized the Trillion Fx...comes out to like $1760 after taxes which is like $200-$300 less than the XPS.
Anyway...here are the specs on that Trillion
[939-pin] AMDŽ Athlon-64 3200+ CPU w/ Hyper Transport Technology
Foxconn WinFast NF4UK8AA-8EKRS nVidia nForce4-Ultra Chipset w/LAN, 7.1 Sound, IEEE-1394, USB 2.0 PCI-E Motherboard
1024 MB [512MB X2] DDR-400 PC3200 Memory Module Corsair-Value or Major Brand More Options
200 GB HARD DRIVE [S-ATA] Maxtor 200 GB 7200 RPM 8MB Cache Hard Drive More Options
ViewSonic 19" E90F+SB Perfect Flat + UltraBrite .21H DPI Color Monitor [Silver/Black 2-Tone]