Now that the Mac Pro is not very accessible or upgradeable, the line has blurred for me between that and the iMac in terms of what should be my next machine. I'll need external hard drives and optical drives with either one, so it really comes down to how much power I need. The main things I do are surf the web, listen to music, look at photos, watch HD videos, some gaming, some basic video editing in Final Cut Pro 6, use Garageband for music recording/creation, and music notation software like Sibelius. My 2006 Mac Pro basically performs well enough for everything I do, and the only reason I'm beginning to think about an upgrade is because support is being pulled for this machine, starting with the non-support for Mountain Lion. My main concern with the iMac is that it ages too fast relative to the Pro machines. I'd like a machine that can stay snappy and 'in the game' so to speak for at least five years. My Mac Pro is at seven years and hasn't skipped a beat. Again, I would choose the new Mac Pro over the iMac in a heartbeat if there were upgradeable hard drives, GPUs, optical drives etc inside the machine, but with those things being external anyway, what's the point of the Mac Pro? I suppose it does still last longer, but how does the cost compare to the iMac? For example, if the Mac Pro was $6000 and lasted six years, that would be to me the same price as a $3000 iMac lasting three years. Thoughts?