Best graphic board choice

Hi,
I know that this question comes very often but i am sorry (for me) it is still the big black out.
Using 2012 Mac pro with Lion 10.7.4
I have both graphic card options:
1) HD 5770
2) Quadro 4000 with the last nvidia driver for 10.7.4 (where dealers say that it is the revolutionary driver (but they are dealers lol)

So what will be the best choice for FCPX 10.0.5 (only) i'm not asking about other apps but only for the best performances with FCPX.
Using at 100% every days Fxfactory

Thanks a lot for any advices and technical lights

AMD.

Well you might as well get the 5870 or 4870 as they are both better than the 5770 for perfomance.

If you can wait there is NVIDEA Quadra 5000 coming out for the mac in November

Other options are the GTX 570 or GTX 670 from macvidcards only, these have been modified so they work in a mac.

So, no way guys with the quadro 4000 with the new drivers ?