Quote Originally Posted by BrianShaw View Post
... but if it is versatility you want, a Vb is a good option. Decent camera and you can easily find a 16-exposure kit and convert it to 645.
Rolleicord Va also takes 16 exposure inserts. And the Rolleiflex T, although it might be a different set of parts.

Either way, go shoot for a while until you reach the limits of the Yashica. I don't have the actual quote, but the gist of a comment on camera-hopping: get a project going, get shooting, and you won't be thinking about the camera.