Opteron 4200 series and folding

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http://hardforum.com – So I picked up a motherboard on the cheap to virtualize some boxes I have and thought why not pick up folding again. With that in mind I was looking for info on what Opteron 4200 series processors would be good for a 2P system and where I can get them ( EBay seems to be the only place I can find them.) Its worth noting I have 12 dimm slots on the board and already purchased 8x 2R 4GB 1333mhz RDIMM. Also, when I spin up a VM for it should I go win or Linux? ( haven't folded for a while.) (Hardware)