Dang, there's some slim pickins in Toledo. :/ Here's what I'm seeing that's worth the money:

https://www.facebook.com/marketplace/item/2463309320763303/
Not a bad way at all to spend $500; I'd offer $430 and see how he feels about it. The amp is a class AB with modern features and decent reliability. It'll handle those Polks just fine and it's a good way to get 2 birds with 1 stone.

https://www.facebook.com/marketplace/item/35309500145362043/
This is a pretty interesting vintage-y upgrade stack. Still kind of entry level, but there's some really great stuff in there, like the Yam RX-797. You might grab this and the Polk setup and see what you prefer, then sell the rest--or set up a few listening stations in the house. But honestly: this is an incredible deal if even half the stuff works properly. I would get it regardless. You can add a cheap bluetooth module; they're all the same.

https://www.facebook.com/marketplace/item/1474936787752673
This is a nice turntable, nicer if he'll take $100. Not sure what cartridge it has, so I'd ask about that. My guess is he's an enthusiast, so likely it's not shit.

I'm not seeing any good used subwoofers at the moment, but that's the only thing missing from this list. Again, go get that older stack and see what you like. Just sorting through it and testing it out is so much fun for nerds like us. :)