OT: Graphics card for intel 667ddr

I have notice that most of the 1gig graphics cards are requiring 800 - 1066ddr. I have a mac pro 3.0 667ddr.

What's the strongest card you would recommend for my specs?

Programs concerned: Motion3 / FCP / AE / PS

""" What you do with what you have, is more important than what you could do, with what you don't have."

> > > Knowledge + Action = Wisdom - J. Corbett 1992 """"