So i will be building a workstation in the coming months and i can not decide on a gpu. nVidia just came out with their new Quadro 4000, but at $750 i was seeing what else was out there. ATI has the new FirePro V5800, but at half the cost and not requiring external power from the PSU, i'm a bit reluctant to go with an "entry" level price. Anyone out there have some knowledge on if ATI or nVidia has the step up for CAD GPU's in the $400-$800 range.