Unless you must have 30" of screen real estate or the 2560x1600(?) resolution, might I suggest a 27" iMac?
Considering a 30" ACD and base Mini is $2500, you will get significantly more performance for significantly less money. The Core2 27" iMac is $100 cheaper than the 30" ACD and it has better specs and capacities than the Mini - including webcam, microphone and speakers.
I was going to buy a 30" ACD for my 2008 MBP, but decided to spend a bit more and get a 27" quad-core iMac.