| If you like your 645e, especially if you use and like: a) the built in metering finder, and b) the built in variable diopter, and c) the Rapid Wind grip, then a replacement body is a good idea.
If you want to move to a body with removable film backs and viewfinders, a (from oldest to newest) 645 Super, 645 Pro or 645 Pro Tl would give you that additional flexibility, but getting one with a waist level and a metering prism and an extra back or two might make the purchase a fair bit more expensive. You also gain access to interchangeable view screens, and motor winders*, but lose the option of the Rapid Wind grip
I have a 645 Super, and a 645 Pro, and I wouldn't mind trying a 645e with the Rapid Wind grip.
Matt
P.S. *urban legend has it that you can make a power winder from the original Mamiya 645 fit the 645e, but Mamiya never advertised that |