I agree that cabinets are not ideal places for speakers, and while I always don't agree with Natalie... I've never heard speakers in the ceiling that were as good as well placed monitors.
There are many good monitors for HT and some are great for music too. I prefer to only comment on speakers I've heard first hand and like Msf commented, I like Soliloquy. However, unless you can get them out of those cabinets and atleast 1-2 feet away from the cabinet and walls the only one I would go with is the Soliloquy SAT 5. These are outstanding sealed monitors and won't give you the trouble that rear ported speakers like all the other Soliloquys are. The Soliloquy S-10 subwoofer is outstanding. I just read a review on it that says it's is very comparable to the REL line, offering more slam than the Strata II and more refined than the REL Q-series subs.
I'm having a hard time getting the Soliloquy C3 center to work right in my system, but I don't think it's the speaker. I would bet that 4 Sat5's, a C3 center and 2 S-10 subs (or subsitute another Sat5 for the C3)would be incredible. If you get them away from the cabinet go with the 5.0 though which offer greater bass extension.
But this is just one option. While paradigm may be considered more mid-fi than hi-fi by some... I still like them. The Soliloquys are defintitly more refined though and are among the most beautifully finished I've ever seen.
I don't know what your wanting to spend, but the Pro Ac 1SC is a great speaker also.