First post here. I have been a mac follower since college and have had an imac (1gz G4 with 1 gig ram, 5 years old). It has been such a great machine, but the 80 gig HD is finally almost full and it is slowing down. I have decided to get another imac 20" 2.4ghz to replace it with 4 gig of ram. I will use it for just about everything (imovie, garage band, the net, ex). I realize the newly styled imacs just came out a few months ago with what I read was pretty minor upgrades to actual hardware. I may can wait until April or so before upgrading. What is the average refresh rates on imacs and should I try to wait for the next updated one to come out? Thanks K.E.P.