If you're looking for a tall one like he is, focus on '87 Tempo's. Schwinn made a lot of 25's that year for some reason and they're not hard to find in good condition. In '88 they made a 23, a 24 and a 25 if you're a 'tweener.

23's on the other hand, all seem to congregate at my place. I've got four of them right now, plus a 23" Super Sport (same frame, slightly better fork).