Agree with getting the Rolieflex sorted out I have an 3,5E and they are great to use, and better lenses and build quality than Yachicamats, I use a 124 as well.
The M3 series Mamiya's are good but a lot heavier, there's issues with the film advance gears which often need replacing but they have the advantage of interchangeable lenses. I enjoyed using mine until they were stolen . . . . . . . . .