best cd mp3 head unit

hey any suggestions on a really good head unit with mp3 capabilities? i got pioneer coaxial 3 ways 120w max (norm at 40w) if that matters at all. model number ts-a1675. and where coule i find specs for these speakers besides power outputs? (like the speakers sensitivity)

also... since my speakers are 3ways would it be wize to invest in tweeters and midrange speakers as well? and im thinking about gettin an amp to power my speakers, since my speakers are 3ways can i have seperate amps to power my speakers lowend and another amp to power the high end (i read seperate amps is a good idea)

instead of investing a 3way and separate midbass, tweeter, etc...just buy a component speaker set. it's easier and less stress to go though. u just gotta power the component with only one amp.

well the 3ways were the speakers that i got when i bought this car used so im stuck with em unless i sell them or sumthing.

so what kind of setup can i do with my existing speakers

ps. ill consider getting subs later