Hi, I've got the RTS, 137ma and 139. The 159 and 167 were/are on my want list. I've not handled either of them but the 159 strikes me as a really nice lump. Interesting about the 167, I think I better find one to have a play with before I eventually part with cash.
Of the 3 I have I find I'm currently using the 139 the most, the nicest to use though is the 137, my long standing camera that I can pick up and use and not even think about it.