One nice thing about the Mamiya stuff is it's reasonably priced
Used 150mm 3.5 AF for $500:
55-110 zoom for $1100:
(p.s. I believe your jig is up Mr. T.)
i have an h1 now, but have used the afd mamiya quite few times (and a couple of times with the p25).
the adavntages with the mamiya;
-high (non flash syncing) shutter speed.
-focal plane shutter can take most of the old non af lenses, 1.9 80, fisheye, 300 2.8, shift. theres heaps of them.
-cheap system if buy second hand.
- when you can get the adaptor plates, you will be able to mount a afd mamiya mount back onto an RZ67, so you you get two systems you can choose.
the disadvantes of the mamiya;
-low flash sync
-no waist level finder
-the ergonomics arnt as good as good, imho
-screen is smaller to look through and way darker
as for price, i think the camera is a small part of it, and the back is what will really cost you. so its best to get the best camera system that works for you type of photograpy.
i really wanted the lens options that you can put on a contax (like mamiya), but decided to keep my canon when i wanted those kinds of options, and go with the h1 because it really is a completly different system to canon. i felt i had more options with these two systems.