I'm looking for a cheap 6.1 surround sound system. The ceiling is exposed so I want 3 rear ceiling speakers, 3 front speakers, 1 sub, + and a receiver. My budget is low. The room is 12 x 22. Any advice would be greatly appreciated. Is it possible to match the rear with the front speakers. I'm looking to spend around 500-600 if possible, if not I will build piece by piece. I want to put in the ceiling speakers while it is exposed. All help appreciated!!