The A2000: overpriced and underpowered. The flagship Amiga of its time should and could have been so much better.
I'll think of 2 more later 
excuse me???
I'll have to disagree there.
in 1989 I got my A2000 because I wanted a more expandable amiga and the 500 wasn't it for me.
this purchase was THE most important of my entire career as it was really the turning point for me (even if I didn't realize it at the time).
I was able to eventually add HD's, memory, acceleration, DCTV, external storage, CD drive and god knows what else.
I learned computer graphics and animation from this computer and this propelled me to work on Emmy award winning projects..
mistake?
not for me