A600 definitely isn't rare... and as A1500 and A2500 are practically same as A2000, I wouldn't call them rare either
Is there much difference between Commodore and Amiga Technologies A4000T models? I've seen many AT A4000T:s, but I don't think I've seen Commodore's.
In think that rarest non-prototype Amigas are A3000T and from mass market productions the CDTV (but I'd call it "rare" with quotation marks
. A3500 is definitely one of the rarest.. I think it can be counted as non-prototype too
