I just finished installing new speakers in front and rear doors and they sound awesome! I originally wanted to keep totally stock appearance, and thought what I needed first was a head unit, but when a guy convinced me to pull my door panels (easier to do than I originally thought- 10 minutes) I found my front speakers completely wasted and barely any paper left around it's circumference. The back door speakers weren't quite as bad. I still wanted stock size, but after doing a lot of research here and other places and talking to many installers, I decided to buy a high quality set of speakers and do the install myself. I went to Car Toy's and listened to their 5.25" to 6.5" speakers and hours later decided that I liked the Focal 165CA's the best for the money. They will fit but need spacers custom made. I put one spacer behind the door panel, then another one between the door panel and the speaker. They look and sound great! Sounded so good that I did the same for the back doors but went with the 5.25" on back doors. They needed the same spacers made, but I also had to trim the openings a little bit. It's a little tramatic doing this install the way I did, especially in the back doors but they look really good and sound great. Now, I'm thinking of adding a sub like an Infinity Basslink where the factory sub is and a new head unit. Changing the front and rear door speakers makes a HUGE improvement in sound, more so than just changing the reciever going through junky stock speakers.
Bryan