Hello, I've been a long time Mac owner, starting with the iBook and up, I've owned various Macbooks, a G5, and my 2006 iMac. It's the Duo Core model with the white case Now, it has heat issues, the GPU is failing and it shuts off when it gets past 42 C. So I have decided to break down and replace it with the 27" i7. Now a few questions I have: 1) the recent recall on the Intel units, does this affect any current model of iMac on the market or simply the refresh? 2) I'm at a debate between a brand new iMac and a refurb. The 300$ is pretty marginal for the same unit. So I was wondering the luck that some have had with the refurb units and if you have had to replace, how quickly they respond with shipping as opposed to a new product purchase. 3) How substantial is the difference between the i5 and the i7 as far as performance is concerned. I game, in addition to using Logic Studio to record music. Some video editing and recording. I want the best of the best, so to speak, but do the i7 owners really find the 200$ markup worth it? I plan on buying this week so any advice or tips is appreciated. Thanks ahead of time.