After the
Prelude vs 560 thread in the main forum, I think anything above the low, maybe mid $200s is overvalued for a 1985.
501 doesn't carry the valuation boost of 531, and 1985 is when they switched to a single piece cast head tube, which rubs me the wrong way even on the off chance it's for the better.
There are some pretty nice bikes valued in the $300 range, and I don't think this deserves to be one of them.