to be honest i wouldnt use this site as a car audio forum, im not being mean, but most dont know that much.

www.elitecaraudio.com
www.termpro.com

only thing is those are kinda high end and who knows how much ppl will help with low end stuff, anywho...

polks are nice, for 6x9's. if your looking for the cheapest but really good sounding check out blaupunkt

goodluck