The RB67 is available at prices below ridiculous !
An extremely modular system of finders, film backs, and excellent lenses.
I haven't used the 500C since I bought the RB67 last summer. The weight
is also ridiculous, but I can manage without a tripod down to 1/60th. of a second.
I also love the 120 /220 6X8 Motorized Power Drive Film Holders !
It's just too tedious to cock the shutter, and advance the film separately.
And of course the backs rotate to allow for portraits.