wildwest,
to me the difference between a gaming pc & an engineering workstation is that a gaming pc's is optimized to redraw changing video (polygon rate, we used to call it) much like when i wascin the commercial video business.
an autocad or engineering workstation is optimized to prrform flosting point calculations as quickly as possible.
an engineering workstation is more to the point, especially if it is your RIP, since your design just sits there, it doesn't refresh 120 times per second
it's easy to hate dell, but i still recommend them, since i am reasonably sure they will still be aswering the phone in a couple years. hp has blurred the line between them and all the acer/emachine and god knows who else garbage over the years, although the nvidia chipsets they use are responsible for the fact that we all have a room full of junk pc's/notebooks, etc