i like high end pioneer, they have really impressed me, more so then alpine. I believe you have 6.5" speakers, dont quote me on that....but I just purchased Pioneer TS-a1680R 220watt max 4 way speaker, very very impressive. youll need a new cd player, i have a pioneer DEH-p6300 headunit, another impressive cd player. youll need one with pre-out so you can hook up amps to you cd player, your getting into a real money pit now, id do a lot of research online, crutchfield.com along with review an audio websites

goodluck