Best commercial speakers I've heard are the S.A.P. J2001 (with twin 12" woofers), which is why I purchased them. These speakers have a small Onken cabinet for the woofers, a horn midrange that is poised on top of the woofer cabinet, and a Fostex bullet tweeter.
I also like Soundlab U-1s. I've also heard some pretty wild custom systems, one in particular comes to mind. It had a pair of huge Western Electric horns for the midrange that have a throat that is curled like a ram's horn. The owner of this system just set up a new system in a huge dedicated room and uses a pair of $250,000 Gaku-On amps to drive the midrange. I have yet to hear this latest iteration, but I expect it to be something special.
I also like Soundlab U-1s. I've also heard some pretty wild custom systems, one in particular comes to mind. It had a pair of huge Western Electric horns for the midrange that have a throat that is curled like a ram's horn. The owner of this system just set up a new system in a huge dedicated room and uses a pair of $250,000 Gaku-On amps to drive the midrange. I have yet to hear this latest iteration, but I expect it to be something special.