Infinity vs Alpine

Hey everyone, I am replacing the rear speakers in my 1990 Bronco. I have narrowed it down to either infinity reference or alpine S series 6'8"s, I plan on powering the speakers with my alpine cd deck with 22 watts per channel. Does anyone have any recomendations on either. I like the infinitys, but I am only concerned about them being underpowered with just my cd deck, thanks for any comments.

I am running infinity kappa front 6x8's and referance 6x9's in back and I'm powering them with a pioneer deck, rated at 22 watts, the only thing I hve to complain about is the electrical feedback from my cars accesories.