I own Def Tech BP 7002s with a CLR 2000 center. It's awesome for HT and very good for music. But when I listen to jazz, I do feel like its a little muddy in the middle, and for classical the violins and flutes don't quite have the airy sound that I want.
I also have a stereo system in my bedroom with Ascend CMT 340s. I've heard other Ascend owners say that the more expensive Sierra series is a level above the CMT, but honestly I can't imagine how. The Ascends do give me the airy treble I'm looking for, yet when I use the stereo to watch movies, the Ascends can still produce a hell of a sound (matched with a big sub, of course).
To sum it up, I've been happy with my DT 7002s for movies, but if you are really gonna use your system for 60/40, I'd get something else. For me, I'm thinking about upgrading my DT setup to Ascend Sierras when I can afford it (towers in the front, bookshelves in the rear). It's not that the 7002s can't do music. They can, but I know there is something more detailed, more transparent, and I want it!