One think I noticed is that all the cameras you list are auto-focus. When doing weddings that can be alright, (the Mamiya is replacing my Nikon N90s which 35mm is getting harder for me to see in the darkroom, so now my wife will probably be using it).
With autofocus, you're letting the machine do the majority of film for you. I'm very old school with my Rolleis I don't even use a light meter, and different speeds of film all get processed the same way, same time, and turn out fine.
If you're not comfortable with manual controls, then go autoeverything, but give the Mamiya a look, there are a couple of little tricks I've already picked up to make shooting faster.
You can always go to pbase and check out actual examples. Plus there is an adapter for Zeiss glass I hear, which is great for me.