My sister has a 24" iMac that she bought refurbed from Apple about a year ago. She no longer has a need for it and I need a computer of my own soon. I've been trying to hold out to find out what the next generation of MBP would have but I need to do something. I want to buy her computer from her at a fair value but neither of us really knows what that is. I checked Craigslist but most of the 24" iMacs in the area are higher spec'd than hers. Can you guys help me out? It has the 2.66mhz C2D processor and 4gb of ram, iMac 9,1 identifier and I think it . Give me a ballpark number for this machine please. Thanks.