Best all around box speaker between 15K and 25K

i also agree with tumbler's reply. I just purchased a pair of totem mani-2's. my reply above was for a very large room. any smaller, i would go with a pair or Totem speakers and invest the $$$$ you would save. You will not be disappointed.

ATC active 100's blow Wilson's away in accuracy, clarity without harshness, and tight musical bass. It's amazing how much bass a speaker rated to 40 REAL hz can produce.
They do need to be played fairly loud to "come on song" and they are studio monitors so limited dispersion / sweet spot. Hey, no speaker is perfect.

Toyota Celica with Alpine sound system.

Avantgarde Duos. But make sure they are set up properly. A badly set up pair will sound very indifferent. Get them right and they sound real!