Hi caraudio.com i'm a newbie here...

So firstly i think i should mention about my caraudio...

i have 2 components. Front Door: Kicker RS65.2 Back Door: Kicker KS65.2 Amp: Xetec P5 EVO Deck:Pioneer DEH-8600

so here is my question. these days im planning to change my speakers because i feel RS's tweets are so harsh. But i really don't know whether i keep Kickers or change...

If i decide to change components then i will replace them with Focals. for Back Door: Focal Polykevlar 165K(2ndHand) for Front Door: Focal 165K2P

so what should i do??? Which is better??? Can you please compare Kickers with Focals???

And one last thing im thinking to buy Kicker CVR15" for sub. mostly i listen techno, club, electronic music vs..(benassi, tiesto...) first of all should i use my sub in sealed box or ported? and second should i buy 12" or 15" in order to get better taste while listening techno...