Köchel is another horn option. Be careful that the speaker you select will work properly with the size of your room.
If you like the sound of horns, be very careful about purchasing another technology. I especially love the articulate horn loaded bass provided by the Köchel K300.
Edgarhorns and Classic Audio Reproductions are EXTREMELY good options as well. Duke at Audiokinesis is a trustworthy and knowledgable dealer that is familiar with differing designs.
Check out the
Audio Asylum High Efficiency Speaker Forum for insight regarding horn technology. Just like other speaker technologies, there are many approaches to horn design, with some liking one approach over another. They are all good, but you will probably have a preference.
If you can wait until October,
Rocky Mountain Audiofest would be a good place to hear a variety of horn designs.