Well back to that price thing....if you wana stay in the mid to upper price range you will put out around $300 to $500 for a good amp,sub,box and labor....mtx is good stuff they have a good 12" sub called the 6000 series with a mtx 4250d amp....with a pre fab box.....this should be plenty...you will need an amp kit and a line out adaptor...tell the installer who works on your car to hook the line out adaptor to the factory sub under the passenger seat......works better that way....use atleast an 8 gauge amp kit...you should hold out on the dynamat until the sub is installed.....audio shops make alot of$$$$ on that stuff and you may not need it......once ur sub is in if you have raddles the tell them youwana get rid of them....saves you some$$$$$ you and the shop will know exactly were it goes and will save you money.....
please let me know how it goes.......
your friend,Bryan