I have never actually used a pro card for design, but I can say that I am happy with the performance of my GTX 580 3GB in 3DS Max 2013.
It seems to be commonly known that the Kepler series cards don't handle Autodesk apps too well. For the time being, anyway.
I would go for a 580 unless you are are prepared to wait for the software to catch up.
The only disadvantage I can see in using gaming cards is that if it's prolonged GPU rendering you are doing then consumer cards tend to run a little hot.