I have an RB67 Pro-S for 6x7 and instead of another Mamiya went with a nice lightly used Bronica RF645 for tall format. Love them both. More lenses available for the Mamiya 645 but the $ ran me off that idea. The RF645 is a super sweet handling little jewel, best control layout of any MF rangefinder IMHO, and as a bonus the VF is great.