I seem to be gathering some of these to me. I love the case design, the engineering, and Dell's choice of components.
Dell XPS 720 #1 (black plastics)
Intel Core 2 Duo E6850 @3.00 GHz
4gb RAM
Nvidia Geforce 8800 GTS GPU
750w PSU
Dell XPS 720 #2 (red plastics)
Intel Core 2 Quad Q6600 @2.40GHz
4gb RAM
Dual Nvidia Geforce 8800 GT GPUs (SLI)
Creative Labs Soundblaster X-Fi Xtreme sound card
D-Link DWA-542 Rangebooster N 300Mbps wifi card
1000w PSU
Dell XPS 720 #3 (red plastics)
Intel Core 2 Duo E6600 @2.40 GHz
4gb RAM
Nvidia Geforce 7950 GX2 (cool dual GPU card for motherboards that don't support SLI)
1000w PSU
Dell XPS 720 #1 (black plastics)
Intel Core 2 Duo E6850 @3.00 GHz
4gb RAM
Nvidia Geforce 8800 GTS GPU
750w PSU
Dell XPS 720 #2 (red plastics)
Intel Core 2 Quad Q6600 @2.40GHz
4gb RAM
Dual Nvidia Geforce 8800 GT GPUs (SLI)
Creative Labs Soundblaster X-Fi Xtreme sound card
D-Link DWA-542 Rangebooster N 300Mbps wifi card
1000w PSU
Dell XPS 720 #3 (red plastics)
Intel Core 2 Duo E6600 @2.40 GHz
4gb RAM
Nvidia Geforce 7950 GX2 (cool dual GPU card for motherboards that don't support SLI)
1000w PSU