I'd have to vote A500. It was (finally) the computer I could avoid back then, after reading so much great stuff in Amiga World about the A1000, while still using my C=64. As I recall, we'd waited so long for the 'Lorraine' to hit the market when it was announced for the very first time, and when it did, as the A1000, we were both amazed, and saddened, because none of us could afford it! :-?
Then the A500 came along at a very accessible price, and all of the sudden, the thing was in my house, looking at me! :-o And it did not disappoint. It was my second computer, and, sadly, the last Commodore machine I would use for a very long time, since right after that, I moved to PCs.