Yes I know that the viewfinder is needed for the 43mm lens. The price I was quoted (without haggling; i am here in China where you can haggle off 15-20%) is $2200 for a Mamiya 7, 43mm lens with finder, and 80mm lens. All in mint condition.
I just dont know if I will enjoy the 43mm lens as much as I think I will. I often find 28mm (135 equivalent), not wide enough.