My room is 14x13 I am pretty lost in home audio i have always messed with car audio. i have 1300 budget for fronts,center,sub. I am looking at a shiva 12" 8ohm sub or i can use one of my 12" dual 2 ohm RE subs from my car. I would like to put 300-400 watts to whichever sub i use but i have no clue about home audio amps. I would like to spend $300 or less for a sub and amp.I can build the box myself for free. The only home audio stuff i have heard is at best buy and circuit city out of those i liked the polk RTI12BK but they are to much. For the fronts and center i can spend $1000. What brands should i be looking at since i am prettty sure lots of stuff is better and cheaper then what they carry at circuit city and best buy It will be used for movies/watching sports and gaming i very rarely listen to music if that helps any.My receiver is a Harman Kardon AVR230. I already have a old jbl 5.1 setup G500 fronts G cinema Sub, with l/r inputs and outputs for the fronts JBL center/rears with no info on them.they are pretty dang old and sound ok at best. My room isnt really big so i was wondering if i should get bookshelf speakers or stick to floorstanding. In a few months i will have a 21x14room to put this inand if i buy bookshelf speakers i would most likely move them to the rear and buy new speakers for the front Anyways sorry if this doesnt make sense i am drugged up and tired trying to get over the flu.