Buy the Mamiya 645 with a normal lens and try it out. If you buy right and end up not liking it you can always sell and get most of your money back. The little money you lose just figure as a rental fee.
I used to shoot a Pentax 645Nll. It had autofocus and autoexposure with matrix metering. I carried it around shooting people handheld. It was a load of fun! I also owned a Mamiya RZ67. It was big and heavy and was always used on a tripod with a flash meter and studio lights. I loved it too.
If you are serious about landscape photography I would skip medium format entirely and buy a 4x5. A little "tilt" alone can make a world of difference.
Last edited by Alan Gales; 02-28-2014 at 12:15 PM. Click to view previous post history.