Anybody here up on values for an B6 Audi S4?

Son wants to buy his second car, trading up from basic pickup. He's looking for a certain generation of Audi S4 (B6).

KBB and other online guides are not much help with cars like this, especially since there is a watershed issue with the timing chains. (Original builds skimped on tensioner/guide materials, and things go badly. Once this is fixed, engines seem to be bulletproof. The fix is like $8-10Km though, so used values are pretty much "Has or Has Not").

Anyway, just wondering if anyone here lives in that world and can help me guide him on this. I can't post in Audizine because he will know I am checking up on him.

TIA