The Tanzer 22's a nice boat. My only gripe with the ones I've seen though, is that they have no hull liner. As I recall, they are a solid fiberglass hull that's reinforced entirely by the plywood interior and bulkheads. I'd be extremely careful purchasing any of them. I'd want to know with certainty that the bulkheads, etc. are not compromised/rotted in any way where they meet the hull. As much as I like the Tanzer 22, it would be further down on my list, as compared to a comparable boat with a glass hull liner. Especially considering at their age, they have a lot of history.
I like a boat where water in the bilge only contacts fiberglass. I seem to recall that if there's water in a Tanzer 22 bilge, there is likely to be plywood soaking in it. See what you think.