I recently purchased an Audi A4 1.8TQ due to a car accident making my bimmer a thing of history. I had a 12" kicker with amp in the BMW and want to add a little more bass to the Audi. What do you suggest in the mid-level range (ie-not too terribly expensive). I don't want to win any contests or anything, just add more depth to my music. I'm looking to keep the price under $500 for amp and sub (if that's at all possible with decent equipment). :dunno: