The XPS does not a SW-approved graphics card. If you do get a different computer, I would suggest getting an approved unit.
If you are doing 2D design, why not try Draftsight instead of SW. It is a free program from SW.
The Dell 5510 is the 'workstation' (GPU equipped) version of the XPS, and will be more graphics rendering capable than the XPS. It comes in several versions of power/price, with lots of options for components, display, ect. A base model will do 2D well enough and start at ~1300$, but you could easily double, possibly triple the price with options and capability. I would also consider looking into the future and get something that will cover your needs for the next several years.