The most impressive speakers I've heard to date at anything near your price range are MBL 101E Mk II. They are $70k new but I've never seen a used pair for sale.
I'm currently running a pair of CS6's. The MBL 101's are one of the few speakers I've heard that I could be confident would be an upgrade from my Thiels.
I'm currently running a pair of CS6's. The MBL 101's are one of the few speakers I've heard that I could be confident would be an upgrade from my Thiels.