So just spent an hour in the reflective palace, this time at night. Ran back and fourth between retina and Air models. Tried to get their screens looking best. In the end I'm going to wait for Haswell to hit the rPros. The screen difference, text crispness of course, but also contrast, color and viewing angles, was just too great. Outranks the extra weight for me. Others may differ.
That 27" iMac is pretty sexy too.