Hi Gents.
Yours answer have been very helpful to me.
Today I have a Mamiya RZ IID with 50mm - 75mm - 110mm - 140mm - 250mm (non Apo), and when upgrading my P45 to P45+ I did change from V to Mamiya 645 adapter.
As wider camera I have a Cambo DS Wide with a Schneider 35mm Digitar which is an amazing camera as I can stitch 2 shots horisontal to a panorama or 3 shots vertical to a big file.
My reason to change from V to Mamiya 645 adapter was, beside the possibility to rotate the back on the camera, that I could get some lighter and more handy on-location camera with a bigger file than my Nikon* gives me.
So I think a god start could be a Mamiya 645 AFD II body and the D 75 - 150mm zoom (as reference) and after that get some used lenses which I can test before buying. Could that be a god solution?
*Nikon gear: Body D2x and D200. Lenses: 12-24/4, 17-55/2,8, 18-200/3,5-5,6, 70-200/2,8, 20/2,8, 28/3,5PC, 60/2,8, 85/2,8PC, 85/1,4, 200/2,0, 300/2,8. Converters: 1,4x - 1,7x - 2x. Nikon flash: 4 SB-800, 12 SB-600, 2 SU-800.