firstly thats a big screen on a stick.
What a cool idea but most people who need that much real estate will surely want a G5 by now?
The favorite Mac I've worked on is my 17", largely because it had a the excellent swivel and wide screen and was compact well still being really fast. I do web development so don't need DTP type space or video speed!
Is this one step to far? For my use a 1.25GHz G4 is plenty fast!