Here's my opinion. The problem, you have a solid budget for a trio of speakers that you want to be outstanding for music, but will serve well for home theater at moderate volume as well.
For this case, I don't think you need speakers designed for home theater from the ground up, which would be high sensitivity horn loaded compression driver speakers. These are 100% ideal for movies and can be pretty good for music.
I would lean towards wider dispersion speakers without horn loaded drivers...IMO you will get a more spacious sound with a bigger, less directional soundstage due to the very wide dispersion which results in a lot of reflections, similar to real life. The issue now becomes that you have to be very careful to select well designed speakers that have very accurate wide off axis response, so that the reflected sound closely matches the direct sound. Many speakers don't get this right. Hell, there are plenty that don't even get the on axis response right.
So I would lean towards speakers that are known to be very well designed with neutral, accurate response and excellent off axis response. Revel and KEF are two that come to mind although there are a good number of other companies that do this well also.
I would still lean towards options with 90dB+ sensitivity in order to get the home theater capability you may want.
Here's the problem though....its going to be tough to find well designed, accurate $6,000 wide dispersion speakers with excellent sound quality for music in matt black finish.
For example, Revel F208 and C208 center would be fantastic speakers that would fit your needs perfectly, but you can't get them in a dull movie theater finish.