I think there is a big difference in the price of the ProII and the ProIID from what I can find out on the internet and I was originally only going to be going for the ProII. Having a camera that can take both RZ and RB lenses would be good as much more a selection of lenses would be available.
I'd search for an RB. The lens issue (plus the 6x8 capability) are big pluses.
"Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."