I'm working up a replacement if my Mac Pro can't be rescued, and really don't want to buy another Pro of the current generation. So, I'm looking at a 27" iMac (I need a new display anyway....). My current machine is a 8-core Xeon 2.8GHz w/16GB, Early 2008 with a few TB of storage, some if it RAID 0. I'm looking at the 27", i7 3.4HGz + 680MX w/16GB and 3 TB Fusion Drive. My main concern is video encoding/tanscoding, FCP, PS5 and XCode (though that isn't very compute intensive typically). From what I've seen, the iMac looks to be a little faster then the Mac Pro, but not much. It is killing me (in my head) to give up 4 cores. How disappointed will I be, if at all, with the iMac? I'll be stuck with it for 5 years or so (my upgrade cycle). Do you think I am going to kick myself hard in 2 years for not buying a Mac Pro, despite the aging hardware platform (not to mention cost)?