Well title says it all. I am liking to buy a budget sub. I Ann the only income in a house of three so budget and best bang for buck is of concern to me. With that in mind and a room size of roughly 13x12x7.5 what sub would you recommend? I just purchased a denon avr e300 and am using the insignia bookshelves in front currently. These will be move to the rear eventual and infinity primus flour standing will take their place. Surprisingly the insignia speakers are very clear and can get loud with no distortion. Thanks everyone.