And I installed a new Sony CD player/stereo head today!

Cost $139AUD, so just a simple and affordable one.
Unfortunately I only have enough money to upgrade the head, so the car still has its stock speakers, which, at first, sounded shocking. Everything had a really piercing, squealing edge to the sound and gave me and my girlfriend a headache.
I fiddled around with the EQ, and all the other settings, and finally, I got a combination that absolutely rocked!
Took me a while to figure out, that if I just cut the mids (by about -10, dunno the units) the sound quality became really even, the bass came through really well, and the general trebles/mids stayed intact and clean, and now I'm really happy! I use a Sony mp3 Walkman by the way, and the sound quality is awesome.
Eventually, I will upgrade the speakers, and get something with a little more bass-support.
Sorry, I don't have pictures of the car or the stereo head just yet!