Many of the Yashica's are over-hyped and over-priced...especially the 124-G.
I wouldn't rule out the Mamiya 'C' series TLR's.
Mamiya's are a bit more versatile...considering the seven (7) separate focal lengths of interchangeable lenses available.
They're bigger and heavier then a Rollei or a Yashica, but my 55mm and 180mm are some of my favorite lenses.
I monopod when I'm on-the-go (or bag-pod), and for most landscapes and portraiture, I tripod the Mamiya.