I'm going to go and offer my install diary if you need it/want it. There is a link in my signature.
If you are replacing speakers, you have many options. If you want better then stock sound, you have far less options. My personal opinion is that the stock speakers sound decent, but the door doesn't. If you sound deaden the door (with Raammat as an example), you'll get good results even from stock speakers. Switch to better quality speakers, and you'll REALLY get results. The poor quality sound is due partially to the stock head unit "EQ'ing" the sound a bit too much, and the factory door panels completely undamped and bare. Again, check out my install diary and ask questions if you want or need guidance in this matter.