if you want to get high sound quality you must take:
for front speaker you can use midbass and tweeters venture ceramic v50 (components) or if you problem about price you can take midbass dynaudio 17 wlq 7" and tweeters md 130 esotec dynaudio(components).both speakers can make a sound so good and clearly.the power ampli for drive thats speaker u can use mc intosh or audison 4 channel and much better you play active with active x-over 3-way like nakamichi ec-302.
h/u alpine CDA-7990R
digital processor alpine PXA-H900
power amp Mc Intosh mcc444 4ch
power amp Rockford 1000bd
tweeter speaker venture ceramic (2)
subwoofer Rockford HX2 (2)