Since the increased print area will be one of the biggest advantages of a larger system.. I would suggest something from the impressive list here:
http://en.wikipedia.org/wiki/Category:Units_of_areaMy favorites are: Dunam, Manzana, and Tetrad.
I'd never heard of any of these. I love wikipedia.
Do you know off the top of your head approximately how much the frame/mechanics (i.e. everything but electronics and extruder) of the Quantum ORD bot will cost? I'd love to build one, but if it's more than a few hundred dollars I'll have to wait until the fall when I start getting a (relatively) large PhD student stipend.
By the way, I just got accepted today to a PhD program at Northwestern, so I may end up in your neck of the woods Bart.