Three Monitor Options for Optiplex 780?

We have about 25 users who require 3 monitor support for real-time data analysis and tracking. These users do not fall into our workstation requirement group. IE, they would come nowhere near needing the performance availability of a workstation, albeit the necessity of the three monitors.  So its hard to justify one for their needs.

I am hoping there is a sound option available for providing Optiplex 780 and 760 users with support for three monitors. I should note, these are the Desktop models, the second smallest available which probably makes the choices that much more limited. Currently we run off the standard ati DVI and use the y-vga adapter allowing them their two monitors. If we add a second low-profile video card with vga connector, would the system allow three monitor's to be active? (windows xp and windows 7). I do not see a low-profile card that would allow two monitors off the dvi (vga y adapater) plus a standalone vga.

Any recommendations on how to accomplish this without a rip and replace?

Thanks guys!