I've settled on a 65mm and 135mm kit with my C330. The 65mm is a better "normal" lens for me, because I lean toward shorter focal lengths, and the 135mm is a great complement to it. And the kit and a bunch of accessories fit nicely in a relatively compact bag.
I think that the "lesson" that I would try to impart though is that while there is some variance in technical qualities, all of the regularly available choices for the Mamiya TLRs are quite good, so you should base any decision on your own preferences as to field of view, as well as condition.
Here is a self-portrait with me and my 135mm lens - photographed in this case using a 210mm on a Mamiya 645 Pro: