Regardless of the price difference (i'm not paying) i'm not sure what would be better for me. MBP 15" or 17" high-end + 30" ACD 27" iMac i7 I intend to use either display to game on via a Windows machine, but arguably the construction of that can be postponed depending on the relative performance of said systems. Frankly I'm unsure of the benefit mobility would bring me; do I actually need a laptop? My iPhone can handle pretty much everything I'd want a laptop to do on-the-go and it seems that an iMac would excel at everything I'd want a laptop to do at home. What's the 30" ACD like in comparison with the iMac's panel? I've never really had to consider this before because iMacs obviously have never had a target display option before. The only other plausible permutation I can think of is an iMac with a MacBook Air, offering the best of both worlds?