Having run Win7 Pro (32bit) on a MUCH lower powered Asus (the hybrid PC/tablet T91MT), I'm sure the newer Asus Win tablets will have no problem running Win7. As I've noted before, in particular, Win7 has 10 or 12 nice "hidden" touch features (pinch-zoom, right-click, etc.) that are exposed with touch-sensitive hardware. Most people are skeptics until they try it firsthand, and then the impression improves for the better.
Having used the full version of Quickoffice on the Nook Color, my 2 cents is that it would NOT be a decent Office replacement. Good for viewing on the road...some minor editing...but not document creation. It's not typing that's the problem, but just the speed and responsiveness of the program on an Android tablet--or more specifically, the kind of hardware that's running Android OS.
-Matt