I'd stay away from Alpine aswell!! The audio shop I work at, we sell Alpine, but only install it in boats.. The RE audio 6.5's are super loud, and really clean. Mb Quart's has afew components systems that are also quite loud and clean. PowerBass is on the cheaper side but great sounds and are loud. With any components you will have to put a amp on them, your aftermarket or stock headunit won't power them right.

 

go with phoenix gold 6.5 they run for around 60dolalrs a piar with tweeters and cross overs