Best Speakers for Very Large Bright Room

I have a very large family room; 24'x24'x20'.  It has a lot of windows, hard wood floors, large flat marble fireplace front, etc.  The room is so reflective you can hardly understand the TV, it sounds more like a gymnasium than a family room.  We have a large area rug and I am working on my wife to put up acoustical treatments.  There is no wall space, it is all windows and french doors, so we are looking at the ceiling.  

I currently have KEF R300 front, KEF R200C center, LS50 rears, two Sunfire HRS-8 subs, Sunfire TGA-7401 400 watt amp, and Yamaha CX-A5100 preamp.

I noticed that when I turn off the center and use a phantom center I have an easier time understanding movies.  I have old pair of B&W 805 Nautilus I use as PC speakers and plugged them in and it was even better.  If you are sitting in the chair off to the side it is a bit annoying because you hear the speaker, but from the couch it is fine.

Here is my question; would a better bookshelf with better power allow an even clearer sound so I could turn the volume down and finally turn off subtitles?  I know a speaker cannot stop reflections but if it will help I will spend the money.

I was looking at the new B&W 805 D3's, KEF Reference 1's, Paradigm Persona B's, and the Sonus Faber Olympica I's.  They all sound great at the dealer but I have not heard any of them in my room.

Unfortunately I cannot do towers as there is a built in and my wife will not allow it.

Any help or feedback would be greatly appreciated!