IMHO the A2000 has a smaller footprint. My A500 sitting here takes up 24"x13" of desk space, and that's not including the external CD drive, the bulky PSU brick, all the cables hanging off the back everywhere, etc. Plus with the A2000 you can set the monitor on top, and even stack the keyboard on top when you're not using it. Much smaller!
Edit: A2000 uses 18"x16" of desk space. Suppose you could always flip it on it's side and "make a tower out of it" to use less space, haha.
