Not a cheap motherboard but the installed power supply is only 300 watts. The Visiontek ATI card I put a link in there for on Amazon only calls for a 250 watt supply which seems very low to me but is one of the reasons I am leaning towards that card.
If you have 2, PCIEx16 slots, you can run 2 low-power dualhead cards which together likely draw less than the Visiontek.... like Nvidia Quadro NVS 295 or NVS 300... depending upon which video cables you plan to use. Also, ATI FirePro 2260/2270 or 2460.... others.
300W PSU is low in today's hardware, but your rig likely runs <150W at idle, so 300W likely enough.