Hey Jeff, I'm in complete agreement with dakkon. Seriously consider a projector. This would make your speaker placement close to perfect ( with a screen infront of the fireplace ). Both projector and screen can be easily made to disappear into a rooms surroundings more so than any alternative, and you can't get a bigger picture...
Look at the Infocus X1 or BenQ 6100, and particularily the Optoma H30, great low budject projects.
http://www.projectorcentral.com/recommended-home-theater-projectors.htm
Good Luck, Michael