I am looking for 6.5 components for my stock head unit in my 02 maxima(non bose). I am not thinking about amplifying them just connect to the head unit.

I heard infinity reference components are good.
Someone also said the polks are good too(better than infinity).
MB quartz dsc 216 on ebay for 120 <a href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1353075895">See item</a>
and the rsc 216 for 170.

I am thinking about spending around $100. So its between the infinity, polks, and $120 mb quarts. What would you recommend for using behind the stock head unit? Will putting these speakers behind an amp make a big difference in quality? Any other brands for around $100?