If you're going to build a rider, don't get too hung up on NOS parts. They'll eat you alive in price, and many newer components are worlds better and a whole lot cheaper. For instance, a set of NOS Hutch Beartraps might set you back $800, and while nice pedals aren't really any better than some of the modern platforms that can be had for less than $50. Old school Redline cranks in NOS condition might fetch $500, but a brand new set of Redlines (similar, but improved) will be a fraction of that. As I'm restoring my 86 Haro Master, I'm swapping out a few things for modern improvements (tires, cables, pegs, grips) that might not be true to decade, but work a whole lot better. I want to ride my bikes, not put them behind glass!
PS- I'd really like to find a Radberry RL20II like the one I gave
a neighbor a decade ago, but the last frame/fork on Ebay went for $700! Argh.