
Another rig that they offer is the "Quad SLI" system now available to the mass market. It is a card with dual GPU's on it, so it isn't exactly like the other one. This system doesn't include the 30" widescreen display like the original quad SLI system either... however, it is an option for $1999.
Lastly they now have the XPS M1210. This is a notebook with a 12.1" screen and the best system offers a Go 7400 or Intel integrated graphics. Pretty fancy system, but still pretty pricey.
More information about the three can be found here:
http://www.dell.com/html/us/products/xps/default.htm