I second the Pentax 645N. With the standard 75mm, it's a great combo. There even is a soft case for it, which I've used sometimes when only bringing the camera with this lens, although I usually put it in a Retrospect 20.
The viewfinder is marvellous, lenses are excellent, but it is definitely more bulk than the Fuji series. Not autofocus but otherwise automatic is the Bronica RF645. Fuji and Bronica have a vertical orientation, which may or may not suit you.