I use a Mamiya 6 it is a 6x6, but an excellent camera:
Very portable;
Light weight;
excellent optics;
good to great (in AE) meter;
silent shutter;
an ergonomic masterpiece;
repairs are becoming difficult to impossible due to parts availability;
lenses are limited to 50, 75 and 150 (the 50 and 150 are fantastic).