I'm looking at the Geforce 210 due to its superior driver support in Ubuntu and XBMC. Also, the different 210's have different power consumptions, the different three being DDR2 512MB, DDR2 1024MB and DDR3 512MB. I'm looking at the latter of the three.
Regarding the powersupply; it's a 1U server type unit, so most probably pretty good quality.
Will keep you guys updated.