Which 6 1/2 inch speakers are the best and most powerful in sound quality and bass?

I have a 2000 chevy silverado 1500 that I am giving a new upgraded sound system to it and I am wondering what speakers would sound the loudest and clearest when powered by my JL audio 70 watt x 4 channel amplifier and new pioneer DEH-P4200VB head unit. So far the speakers I have been looking at have been Alpine, Infinity, Boston Acoustics, kenwood, and Polk. I would love to here everyone suggestions!