[ahausheer]

I have personally made custom brackets for 6x9s and it sucked, if you have never done it before don't its not worth it. Small speakers are just as good as large speakers except for the lower frequencies, you need a sub for that. Get speakers that fit the stock locations, just get high quality ones and for really good sound you will need a decent amp. Many ultra high end sound systems use smaller-ish speakers and they are always round. In either case use the stock speaker size.