I'm ready to buy Aperion speakers as my 5.1 surround sound system for my new HDTV. I will spend about 60% of my time watching HDTV and Blu-ray movies on my HDTV (gaming and music will make up the remaining 40%).  I am torn between the 4 and 5 series front speakers and center channels. My room is 15 by 22, has ...