A600 is the worst. I owned it for 2 weeks and sent it back.
A4000T has given me the best range of uses, but I have very fond memories of the A1200. The A500 and B2000 give me fond memories also, but in those days the novelty and awesomeness of the Amiga made an impression on me quite easily.
An A1200 with a Blizzard 060 and SCSI kit and internal scandoubler would probably suit me just fine, overall. My A4000T with PPC/060 is better spec than that, but it is a hulking brute and I haven't used it for a long time.
