I was considering selling my Hasselblad 500c/m so that I could get a (preferably) Mamiya 6 or possibly a 7. I am looking for something more portable and although i love my Rolleiflexes for this I feel the Mamiya would give me the ease of faster shooting for street shots. I don't feel the Hasselblad always has to be on the tripod, but it is more cumbersome then a Mamiya. I was just concerned about the build quality and the rangefinder adjustments of the Mamiya. Any thoughts on this?