Amiga 1000, the only Amiga that was the best desktop computer, AND best looking, in the world on the day it was launched. Downhill all the way from A500 really.
A1200 once reduced to £299 was a good machine too, not at £399 without SIMM slots for fast ram though. 2.5" IDE was a classic cockup.
Rest were either ugly, overpriced, cheaply made or had zero improvements over A1000 OCS worth nothing.
The A4000/030 was a special dead turkey, all people wanted was a 28mhz 020 (same speed) with 2+2 memory in an Amiga 1000/3000 style slim case (for use of cheap 3.5 IDE drives) which Commodore could have produced for half the cost of A4000/030. Commodore gave us a 486 priced Amiga with 286 performance....nice!
A4000/040 was at least justifiable in 1991 on spec/price. Not in 92-94 though.
Yes it sure went fast in the beginning of the 90`s PC were getting bigger and faster very fast, just think of Wolfenstein in 1992 and Doom in 1993, it easy to see why Amiga could not compete with other machines. my Amiga 4000/030 with 18 mb ram can not run Doom very well.