1. Quadro 4000 - low power - good to go $200 video card - can support 8 vSVGA vm's at once (limited to ram of video card)
2. ESXi 5.1 driver supports quadro 4000,5000,6000,Tesla(??) video cards! the 4000 is a great bet since it uses little power and vsvga kind of sucks (dx 9 limit,256meg...