I know that the a3000 is usu. considered to be the peak of the maturity of the ami architecture, but I didn't like it a whole lot from - yes a space perspective - that and its cost. Certainly looks nicer than an A2000 but I still like the 2000 due to the fact that there's just a lot you can do with it.
I always wanted a 3000T.
Speaking of batteries, I'm still running on the original Varta batt on my rev 6.3 A2000. Doesn't seem to have leaked.