I'm not only a custom home theater guy, with over 6 retail stores and 15 years around this business, but am a long time two channel audiphile as well.
My recommendation for effective Home theater sound is still to consider more refined sounding, yet DEDICATED HOME THEATER SPEAKER SYSTEMS...that were designed as such...not music speakers doing "double dubty". That's my first recomomendation.
Let me say that, as someone who's sold everthing from Dunlavy's to Wilson's/Thiel's, B&W's, JM Labs, Meridian's, Logan's/Maggies, all the way down to more commercial Def Tech, Klipsch, NHT, M&K, Tannoy, Polk, etc, that you can indeed spend a lot on speakers, and not get the returns for your money for an effective home theater experience, just as with 2 channel! And this is very easy to do wrong, let me tell ya.
I would still strongly suggest you consider my recommendations I previously posted elsewere, and look at the KLipsch THX stuff, and Infinity Prelude MTS system if you want more refined/flexible audiophile music. Yes, the Def tech with powered subs has good dynamics for HT, and I've sold all that.
I can get anything I want at mostly cost, or close, and I like these systems for what they do, for what they cost. They're good for even larger rooms, and sound great.
For a dedicated HT system, for a passive setup, I'd recommend the Klipsh THX wholehartedly over most out there right now. It's very affordable, and very good sounding...especially potent on HT, and more refined than commercial theater speakers by far.
Anyway, I just can't recommend anything else I've come across for that money range, even more expensive audiophile speakers I've heard.
Other choices are to go Powered speakers, like M&K THX powered 150P's, active ATC mini-monitors(acoustics need to be spot on however with this design), and similarly active models.
YOu want "focus", dynamics,dialoge inteligibility, coherence, good detail and dynamic range, and PRESSENCE from a good HT system!...not laid back audiophile speaker sound. This yields a decidedly uninvolving sound that's not thrilling or effective for movie mixes in my experience.
The other, at least as equally as important part, is getting it all set up right, tweeking it, dealing with critical acoustics, and making it all work together, no matter what you get.
Invest in good experience, and it will be superb. If not, you end up with lots of mediocrity, and ill-spent money.