There are lots of 6x7 cameras. If you are unhappy with the RB/RZ concept, the Pentax 67II indeed should be your best choice if you want a SLR. The Bronica GS-1 has the box design of the Mamiyas (without the revolving back) and offers much less lenses than the Pentax. There are also rangefinder 6x7 cameras like the Mamiya 7II, the Plaubel Makina 67/670/W67, and the Voigtlaender/Fuji folder. From my point of view, these are not really alternatives to the Pentax 67II, rather complements. I use two 6x7 cameras for landscape photography. The P67II is by far the most versatile and my favourite camera overall. I also use a Linhof Studienkamera with 6x7 revolving back when tilt is required (and for the fun of using it). Joachim