I went with alpine all the way around.
Started with Type S 5 1/4" Alpines in the back
Then went with Alpine Type R components in the front
I did however have to build a custom door pod for the front speakers seeing as they were to deep to fit.
The sound is amazing. kinda pricy but worth it. I would definatly amplify them if you go my route. Im running the Rockford 400.4 amp on mine.
Oh ya...and this is all in an 02 WRX Sedan.