Now that Sonus Faber's Olympica line has replaced their Cremona line, you can find lightly used Cremona M's (a $10K floorstander) in excellent condition for around $6K. There are two such A-gon listings right now (I have no affiliation with either of them). I think the Cremona M is a fabulous speaker, musical, articulate, detailed, and emotionally involving. It doesn't take a very expensive amp to bring them alive, either.
They are also drop-dead gorgeous, so there's a good chance that they'd have a high WAF as well.
They are also drop-dead gorgeous, so there's a good chance that they'd have a high WAF as well.