Nicole, go learn about what your talking about, Sony is crap for car audio. Pioneer speakers, subs (all but one line which really good) and amps are decent. Pioneer stereos are great. Anything from Sony for car audio is just plain pathetic.
For the best sound from your iPod through your car stereo look into Alpine. Sorry to be the one to inform you this but just about every stereo on the market that plays iPod's will control the iPod though the stereo. Good amps, kicker amps, Rockford Fosgate amps, Memphis Audio, Elemental Designs Audio, US Amps, just to name a few.