I am going to have a 17 ft (back wall to mantle TV) x 19.7 ft. grand room with vaulted ceiling. I would like to build the speakers into the wall so they aren't visible (a plate flush with the wall will cover their location) save for the front speakers which will go inside a built in wall cabinet. I'd like to have it 7.1 and spend around $1000 on the speakers. What can you all recommend?