For very high quality home theater, you'd want main speakers that are free from coloration; disappear as the apparent sound source; give a wide listening area; have enormous macrodynamic capability without becoming harsh; and finally have excellent clarity, detail and articulation. This is a rare combination.
May I suggest you consider the GedLee "Summa", designed by the world's foremost authority on waveguide design, Dr. Earl Geddes (I'm Dr. Geddes' first dealer for this speaker). The price is currently under $5,000 a pair in matte black finish (for minimal light reflection in a home theater application). Here's a link you can follow to learn more about the Summa:
http://www.gedlee.com/new_loudspeaker.htm
For more in-depth discussion, take a look at the white paper accessible through that page. I think Dr. Geddes' design (using high quality prosound drivers in a unique enclosure that gives very well-controlled radiation patterns) is extremely intelligent and I think I understand it well enought to respond to most questions if you have any.
Dr. Geddes uses three Summas (front mains + center behind a screen) in his system, and has done several custom home theater rooms for clients using Summas. He has also written an excellent book on home theater, linked here:
http://www.gedlee.com/Home_theatre.htm (This really is a different link, even though for some reason it looks like the same one.)
Best of luck in your quest!
Duke