Alright, I have 2 questions right now: I'm thinking about getting a refurb iMac in return for my iMac, the 3.06Ghz 8800gs model. I should have done this in the first place; I didn't know they were so cheap. So, question one: How much better is the 8800GS than the GT 120? Also, if the time I can return my iMac is by March 31st, can I return it tomorrow?