Which sub would you buy for the best sound quality? I am probably going for a 12" but may go 15", single, in a sealed box. The Brahma, Shiva, Perfect 12.1, Alpine type R, jlW3, IDmax12, ACI sv 12, ads 312rs, Alumapro Alchemy, Audiomobile Mass 2012 or something else? I am going to buy the JBL 1200.1 and probably the Clarion DXZ 825 receiver, using my factory speakers for now (wish Ford would end this 5x7 crap) in an extended cab F-150. Almost everybody seems more interested in spl but I really care about SQ and getting good sounding deep bass. Any input on 5x7's appreciated too. Thanks.