A year or so ago, I was at Boulder Amplifier and heard their reference system (and room) built around Stella Grand Utopia's. Easily a > $500k system, not counting the cost of the room. They poured a separate foundation for the listening room, built the room, and then built the factory around it. Delightful overkill :-)
Not that long thereafter at a Colorado Audio Society meeting, I heard a member's system that featured a set of Acoustic Zen Crescendo II's in a smallish room. (His electronics were home-built). I was struck at how similar the soundstage, dynamics and overall voicing was to the Grand Utopias. They are $25K new and I recently saw a used pair advertised on Audiogon for ~$9k. Didn't have the spare change lying about or I would have pounced without hesitation.
I think they're a must audition in the price range you're talking about.