As a shooter, that is a great gun, I don't know anyone would put STI parts in a gold NM. Silly I would say.
But everyone can do what he wants with his gun, as long as it is still safe.
With the crappy paint job, the other guys are close at 800.oo , 1000.oo maybe if you have all the original parts., but would be a hard sell
I would have it in my case at 795.oo, but I would try to go back to colt parts and strip the slide.