Alright so I'm piecing my home theater set together and I already have a receiver, but next is an important piece. Me and my friends are throwing a party on the 31st and with music, it might be good to have a sub. The thing is, I already have two towers that have two 8" drivers each, and they put out really good bass. My options stand as follows: Get a center channel, because a good center channel is really sexy! Get a subwoofer so the bass is good and the mid-highs - highs are good because I'll have less bass running through my fronts. What do you guys think?