RRRRRRRRRggggghHHH
I'd have to say the A3000....
because I got some of the very first... apparently not quite finished ones, though Commodore didn't mention that to me. Maybe somebody warned me about using ther Digi-View thing with an A3000...? Somehow, it destroyed the A3000 internally.
Commodore, in a show of excellent customer service, sent me a new A3000 without even asking for the old one back! So... then I had two A3000s. It wasn't long before the new one was destroyed in some weird way also, apparently by the Digiview thing but possibly due to aulty electronics inn other ways (according to the techs I talked to, it just wasn't really ready to be released at the time... must have been Fall '89) . We had the motherboards replaced on both of them, if I recall.
The A3000 was great, though, MUCH better than an A500 due to the 68030 processor, higher resolutions, built in HD and WB 2.0. However, man games - Shadow of the Beast or instance - simply would not run properly, due to the graphics hardware or the OS I guess.
If I could do it all again, I'd get a 2000 or 2500 and soup it up instead of buying the A3000. We did end up with two, though.. that was cool.