Ritzcam.com and Collectiblecameras.com are the same company, but different web interfaces. I always used Ritzcam (I guess) or Collectiblecameras looked the same until recently.
I can recommend them whole heartedly. I bought my user M2 from them, got a great price imo ($415 shipped) and the guy I dealt with (Bill I think) was extremely patient in dealing with me. I bid on the auction on ebay, it didn't hit the reserve, we talked back and forth about price, told me the lowest he could possibly let it go for, I agreed, but was too broke to pay it at the time. He promised me he would keep it waiting for me and not sell it until I told him I was no longer interested. About 3 weeks later I finally paid him, recieved my M2 shortly thereafter in better condition than I was expecting (except for the described pinholes in one curtain, which I patched).
So, I was originally intent on getting a Canon 7, or a Canon P, and ended up getting an M2 for a little bit more. I'm happy.