Ok I have tried researching and come up with no more answers. I am considering buying either a new or refurb iMac. I don't care if it's 21.5 or 27". I want it to be able to stream HD video with windows media center to two tvs simultaneously(via the network with the video output by xbox 360s as extenders) via vmware fusion running windows 7 in the background while also being fast enough to use for everyday tasks while this is going on. I also have about 220 movies on a hard drive, they are all either 2gb pvr files or 4gb DVD rips that I would like to encode to something iPad compatible with handbrake other than that my usage is light. I have 4gb of 1066 ddr3 from a MacBook pro sitting here so I feel a refurb would be better as I could upgrade to 8gb of ram but I am unsure of what CPU and gpu would be required