No, try a gaming card first. If you have any issues with it, THEN you can try a workstation card.
Gaming cards in this day and age are perfectly fine for most 3D apps (Maya, Mudbox, and 3Dsmax will all work fine, I assume CAD will also but i haven't used it myself).
Workstation cards used to offer a benefit, and still do to a minuscule extent, but the cost is bleep-ing exorbitant. A 5850 will be as fast as a $2000+ workstation card. And what do you get? Some slightly better drivers (that are released more infrequently). PLUS, workstation cards now come out after gaming cards, so they're all based on older hardware.
Only get a workstation card if the gaming card gives you errors that you can't live with.
People need to stop recommending Workstation cards for common 3D Applications.