I knew when I asked this question that I would be stoned for even implying that i wanted to sell some of my gear. LOL!!! I only mentioned the MF gear...not the 35mm and digital stuff. To me the RB is the most enjoyable to shoot but the least practical. to carry around. The M645 has a meter in the prism so it is lighter and more convenient. But with a neck strap and waist level finder the RB can certainly be used without a tripod. I will probably just keep everything.
I have three guitars I made for myself that I have been thinking about trading for more gear! In one breath I am talking about thinning out my camera collection and the next trade something for more gear! We have a incurable sickness!!!