Hi Dears, I would like to buy an iMac. i have macbook, mac mini already. Now want to have the best Desktop I like 27" for sure but don't know which series I would go for. So come here to ask you guys. - is that much difference for a student like me to study, write paper, linux based programing on quard core or dual 2 core imac. They are like 4-$500 difference. I thinking about buying 3.06Ghz dual 2 core version but still concern for i7 (i5 is just $185 difference from i7 so I don't choose). The reason I concern because imac is not upgradable. How do you think ? If buy it now, where do you thing I should go for. ? Apple.com has promotion now but I don't really need itouch, printer and tired of adv them and selling somewhere. Ebay and Craislist may be a choice. I am in NYC. How do you think about this ??http://cgi.ebay.com/Apple-iMac-Z0GE...iewItem&pt=Apple_Desktops&hash=item27b2fff4ab last thing is: is that the good time to buy or wait until the semester start with the newer version ? many thanks for any commend.