I replaced mine with Kenwood 5x7's front and rear, and removed the tweeter (the Kenwoods are 2 ways). Components would be great, and would sound better than a 2 way in the door like I have now- but for a lot more money. Also, based on my research, components really need some power to sound good- so the stock head unit power isn't gonna cut it. If you go with components in the front doors, plan on adding an amp as well. As for rear doors, just any decent speaker will work. About 80% of the sound you hear from your stereo comes from the front, the rears are mostly ambient and rear fill. I would recommend Crutchfield or a good local stereo shop for the components (unless you know your stuff and then ebay is a good idea). Let us know what you decide.