I'm building a theater room in my basement, everything is done and its time for AV side. I know little and that is saying a lot, so my question is this, I'm using a 5.1 system but I'm unsure of speakers, I saw the Polk audio TL1900 but I'm unsure those will fill the room. My room is 12x20 with 8' walls. I know that speakers can go from 50 bucks to 2000 a speaker so I'm a bit nervous. I'm not a audiophile I just want good sound. This room is used for nothing else. Please please please advise. Thanking all in advance.