if your doing any HD texturing or high poly count modeling there is no choice but to go with a workstation card. that is what they are made for and any benefit from cuda a 580 would get you the equivalent workstation card has cuda as well.
Actually, if you use Cuda cores and nothing else is much important buy GTX 580s(two and SLI them). Or, however, if you do extensively use 3ds max and other CAD/DCC apps, do buy one Quadro 4000 and two gtx 460s. Most important point about Quadro is drivers and ability to use Open GL on it's original performance(gaming cards don't use it at all).
I personally don't know how they(who does) use Quadro 4000 and gtx 460s at the same time, is SLI able to SLI them, but on other hand they have same GPU and similar chipset.
This will be cheaper than Quadro 5000, and much effective than GTX 580 or gtx 590.
You'll get many Cuda cores, huge stability and reliability. And more performance is not a question, you'll not need it usually, especially at studying basis. that's more than needed.
Unfortunately you can't get with much up-to-date AMD FirePros, their parallel processing units are not able to do anything, and only this is reason why you shouldn't go with them.
e.g. disable one's renderability and still use it, if you meant that.
and what work it does what helps?
actually I did not get your point, what you have said
when a gpu is used to render it is not acting alone. its like a hybrid car, the engine and electric motor work together to get better milage but in the computers case the gpu and cpu work together to lower render times. gpu + cpu = gpu acceleration.