You may want to look into getting a MiniDisplay to DVI Adapter like this one
http://www.amazon.com/Accell-B087B-0.../ref=pd_cp_e_2

I have an ATI 5870 that I use to power 5 monitors. I picked 3 of the adapters, and one of the dual link adapter (which you dont need unless you get a larger monitor like 30').

I had no luck at finding a decent monitor that supported mdp.