I think you are asking for too much. The Ohm Walsh speakers are nice and they are 360 degree radiating, but compared to other speakers, you are going to sacrifice coherence/clarity. They are not extremely efficient at about 87db.
You could look into MBL speakers with the 360 degree metal ribbon radiators, but you are at a significantly higher cost area, and they are much less efficient at about 84db. They sound absolutely amazing, though.
You are most likely going to have to compromise one of your requirements.
For a conventional speaker, look for tweeters where the dome extends further out of the surface plane. This allows the dome to radiate in a wider dispersion area. An example would be the Morel Supreme Tweeter:
Though, I don't think the Morel speakers are that coherent/clear. They have a tube-like bloom to the sound.
Good luck.