Best video card for triple monitor GX620 system.

I have an Optiplex GX620 MT (medium tower) purchased in April 2006.  It currently has an ATI Radeon X600 dual port video card (although one port appears to be duff).

I want to run a 3 monitor setup (3x 2007FP monitors, 1600x1200 each).

What would be my best choice of video card(s) to support this that would be compatible with the GX620?  I would be using the system primarily for business applications and software development - not gaming or heavy-duty CAD-type work.

Thanks

Nigel