The way i've come to that rough valuation is this:
503 CW body - about $ 500
Magazine - about $ 200
Winder - about $ 300
120 CFi - about $ 500
80 CF - about $ 300
50 C - about $ 200
Not an exact science, that. And very much depends on condition.
It may seem that i undervalue the C lens a bit. But i have bought a bunch of those (separately, from different sellers) lately, and none for even that much, and based my valuation on that.