Suggested Build for 3 Projector setup

[ModSim01]

Asking the experts. I am building a 3 projector on 3 flat screen rig. I am currently running it all off of a single ATI Radeon HD 5870 eyefinity card (6 display ports). I am using mini-display port to VGA adapters for all 3 projectors since the card can not handle 3 HDMI's. My goal is to try to get all 3 projectors running 3D - I am using Optoma TW675UTiM-3D projectors. I am throwing 8' wide screens - at the moment I am running 3x(1280x1024) - but I am playing with this. Anyway, I am ready for a new card(s) and wondering what you might suggest - make/model/number.

Any thoughts/suggestions are welcome.

Thanks.