Autofocus and medium format - will move you into 645 territory. Unless you like the Rollei 6008AF - same beautiful Zeiss glass as Hasselblad, and 6x6 shooting.
Otherwise I'd gladly recommend the Contax 645 cameras as well. Very good autofocus capabilities. The Pentax 645 cameras seem to work really well and have lots of happy users.

Good luck, Ralph!