Get the iMac. (Unless you want a computer you can comfortably lift for more than 20 seconds...) It's a really fantastic machine - the display is great, the speakers are very good for built-in ones, and it definitely wows people the most.
So...I ordered mine. Just the standard 2.16 Ghz with 1 Gb RAM, but that's the same config as my 24" iMac. Works like a charm and the MBP should be in pretty soon I hope.