are you guys serious? alot of those are cheap crap... check out
www.REaudio.com or
www.edesignaudio.com or ascendent audio, avionixx amps... only worth while subs and amps unless you can afford some JL w7s or w10s. as for head units I only go for eclipse by fujitsu ten.
everything else is garbage. I dont care if it bumps super loud if it sounds like an ass its not worth anything.