I'd like to nominate these two machines. They're not very special but I still find them very attractive.

The black version of the well known Goldstar FC-200

The black version of the (not so well known) Epcom Hotbit HB-8000.
By the way, and a little bit offtopic, the best design on a homecomputer
ever is this:

The old Commodores are so cool, when I saw one a few years ago I decided I wanted to have one of those. I'm not realy intyerested in the technical aspects or even software, I just love the seventies design.