There is not best, its all on your ears & budget.
As far as mids/highs go, Id go w/ focal, Even low end focal will blow alot of company's high end stuff out of the water.
As far as subs go, Ive always liked JL, The IDMAX's are tight too, Alpines R series seem to be pretty good too, Or if u want straight up bass, look into Digital Designs, My friend had 1 dd 9515 w/ 2 class d amps hitting close to 160 in a GTI.
As far as amps go, If u want clean bass, look into Mcintosh, they look straight outta midevil times but they are very clean, & again...for all out bass, Id look into class d amps(memphis,kicker makes nice ones,MMats), Fosgate amps are alright, but they always used to cut out on me when they got hot, Its all on u man...SQ or SPL.
As far as HU's go, Alpines got some nice ones, as does pioneer.
:fawk:, Have a nice day!!!!!