There isn't much difference between the price of the RB and the RZ I don't think and the more modern the camera the easier to fix if anything happens I guess hopefully this won't happen but if it does its always easier to find the newer stuff. One of the things I find interesting is that people would sell an RB and then go for the RZ. I've just ordered from the mamiya website brouchers about the cameras and see what it says in these before I make my final decision on which one to buy. Thanks for the help everyone.