Ethernaut05

I've had the car only a month but can't stand listening to rattle out of the back on any deep notes. Know a lot of new Acura owners who swap it out for a new one and amp. I know theres many threads on this nature...if anyone can give me some product suggestions for a clean sounding bass. Also..I was considering ordering from Crutchfield and having a friend install but whats your thoughts on bringing it in to a "Circuit City" or "Best Buy" or something....look forward to your thoughts! Thanks so much!