I like the A1200 desktop for it's features and simple expandability.
I love the A2000 (my first machine) because the casing is well designed so that you can pack everything you need inside it (Unlike the bloody cramped A3000D).
Currently I've shelved all of my Amigas except for the A2000. This year I've been souping it up with new kickstart ROMS, an accelerator/RAM card, CV3D graphics card and OS3.9. OH, and I did the NTSC to PAL hack on the mobo last month too.
Whoever designed that A3000D case needs to be shot.