Personally, I liked the A1000 best (as one of its proud owners of course
), because it was in my opinion - regarding the design - one step beyond my friends C128. I also liked the A500 but I thought the A1000 looked by far more professional.
Of course the Amiga logo itself is absolutely fantastic whereas I sometimes were close to pull away the Commodore sticker that was plugged on the A1000's front. But as always taste is a matter that's hard to discuss, everyone has his favourite design preferences so my opinions of course very biased