Have you looked into the Atari 8-bit home computers (800, 800XL, 130XE)? They were designed by the same people who designed the Amiga (eg. Jay Miner) and are basically 8-bit Amigas.
Yep. I had a C64 and my step-brother had an Atari 800. It was a cool machine as well. Same processor, but radically different graphics and sound chip, if I remember correctly.