Greetings All. I'm way late on this thread, but I'll add a nickel's worth.
i helped a friend look for a 12-14' boat this summer and looked at several Avons. One (Scout I think) literally looked like it just came out of the box, as it had been garaged for many years. Some on this thread may recall that the fellow initially asked around $9000 for it, but later came down, though it was still a pricey. Several of the others were 80s vintage boats and had not been well taken care of. D-rings, handles, and re-furbishing/replacing valves are just tlc work, but when the material is truly worn to hell, you can't do much. One boat's material felt a bit like old sandpaper and not even a heavy bath of 303 would bring it back. I think the state of the hypalon or pvc is one key to look at. I've also seen poorly cared for pvc boats that had cracks in the material. As a few here have commented, wait/go for a bailer. Lots of commercial companies are cycling out boats as the season winds down, some of which are in reasonable shape.
Congratulations on your new boat. Looks great!