This is a guide to help new comers that want a sound system for their car.  There are 4 major brands that are very reliable and have awsome wattage, sound, and bass.  The four would be JL audio(12 or 15 W3's are really good along with 15W6 or 13W6 or W7's),  Audiobahn audio (flame series are good series of speakers), MTX audio (series like thuner 8000's or sludge hammer's), Rockford phosgate punch subs (best series is punch P2's).  All of these brands would be a good start to a great sound system.