Mamiya 6 or 7 if you want interchangeable lenses and a very small kit. I love my Hasselblad too, but it's bulkier and requires a tripod more often.

Agfa Super Issolette (or Ansco Super Speedex is the same) if you can live with a single normal lens. These fold up nice and small and take excellent pictures with a look that is more classic than modern.