Here's a bit of info on video cards for Mac Pro's. You basically have two avenues:

1. Genuine made for Macintosh (Mac Pro) video cards.
2. "Flashed" video cards originally made/programmed for Windows computers...and then "flashed" with Mac ROM to work with Mac Pro's.

I personally like to stick with the genuine cards...just so there's no (or less) potential headaches down the road.

As far as "Genuine" video cards for Mac Pro's. There really are not that many to choose from...and to make the choices even "thinner"...sometimes there are things that make some video cards (from older Mac Pro's) not compatible with newer Mac Pro's.

The ATI Radeon 5770 & 5870 are the video cards that Apple is currently shipping with the current line of Mac Pro's...so they can't be all that bad! Yes they have two mini-display ports (and one full-sized DVI port). Just need an adapter for the mini-display ports.

If you want a video card with two full-sized DVI ports...you will most likely have to use an older video card...and the performance of that video card may be worse than the 5770 you currently have.

It's always possible that if Apple updates the Mac Pro lineup...that a newer/better video card will ship with them...but then they will probably be expensive and there's no promise (in fact probably unlikely) that it will have two full-sized DVI ports.

HTH,

- Nick