We thought about trying to do a projector and screen deal, but it seemed a lot for the room--the dealer was saying how we could get a 120" picture...the ceiling is 8' high...the room is small. He seemed very intent on this. But all I could think was how could I realistically take in the entire imaghe? I'm going to be sitting 10' back at most.
If your intent is mostly to watch movies and use this room as a nice home theater for dark viewing, then going with a front projection setup is a great way to do things and will give you, by far, the most immersive experience.
The general guideline is you want about 10" of diagonal for about every foot of viewing distance. You mentioned the room is 15' deep, but then say that you are most likely viewing from about 10' away. That means about a 92" to 100" diagonal image is ideal for that viewing distance for 'center of the theater' feel. If you like sitting a bit more towards the front, then slightly larger is ideal.
The Sharp 80" display is very solid, but doesn't have the motion handling capabilities or black levels of a decent projector, and won't feel nearly as immersive. This is (clearly) your choice, but I would truly avoid LCD for a critical viewing area and would stick with plasma in a small room or front projection in a medium/larger room if possible.
Front projection requires the turn from 'we want to do a theater' to 'we are doing a PROPER theater' for best results. Many people have white walls and light carpet and furniture and throw some speakers up and a big TV and call it a theater. While I certainly agree it can make a nice surround setup, the difference is the atmosphere and the immersiveness of a theater.
I would recommend, the Carada Criterion screen at 100" diagonal with a 10' viewing distance, with their Brilliant White material.
I would put in the JVC RS45 projector (with 3D option if you want it).
The PS3 and HD cable (sat/fios/whater) for your viewing.
I like the Sharp displays just fine, but I am most likely to get that for my family room and move my 64" plasma to my future theater space along with a projection setup. The best room gets the best displays, and LCD is just not what I will put in.
If money were no object, the 85" Panasonic plasma is about the best darn looking display I have ever seen. That is truly a 'money is no object' display, as are their 103" and 152" plasmas.