Don't forget that when you see guys doing "massive multi million poly count" work, they will most definitely have 32 (Bare min), 64 and +++ RAM!!! Just to open the model and allow a GPU to work.

http://www.videocardbenchmark.net/high_end_gpus.html

The QUADRO will give you drivers which can be profiled (Even for specific apps)

If you are not using that, or have them in concert with Xeons and ECC RAM, then for what?

I7's = GTX
Xeons = QUADRO