I can't seem to find a combination of head or head/quick release system that doesn't cause me grief.
I should steal a page from
@DREW WILEY playbook, and mount my 8x10 on my tripod legs without a head and quit whining.
That being said. A budget 3-way head would be simple and easy to use for you. The Mamiya C series are a bit heavier than some other TLR's, so perhaps a ball-head would serve you well?
There's also the Bogen/Manfrotto 410 junior geared head.
Another consideration is whether you will be using a prism finder or the waist level finder. It may turn out that one head works great for prism but not great for waist level. There are almost too many options and variables.
Do you have a head that you like with your other formats? Try that combo out and see how it goes.