Save up a little bit more,
- upgrade your 5.25" to 6.5" the budget one should be Boschmann (if you want, can pm me, i'll give you a very special price for new set).
- install a monoblock amplifier cheaper brand such as Marriolla and a DVC subwoofer.
- for better result, install RAAMmat BXT60 sound proof at your front doors, best bang for bucks sound deadening material so far. (GRexer selling it).