> Amiga 1000 was released in mid-1985, although I think few units were shipped before 1986.

It was announced on July 26th, 1985 at Lincoln Center with Andy Warhol painting Blondie (Debby Harry) live on-stage (a demo which was re-created at the Computer History Museum this past Summer as part of the Amiga 040th celebration). But you're right it wasn't commonly available until the late Fall. I managed to get mine at the end of November.