the other day i got myself a Kicker 300 Watts RMS Dual 12" In Ported Box, Kicker 200 Watt RMS Amp (2 channels), and Sony 4-Channel 600-Watt Xplod. I wanted to get new head units and speaker that would fit the car but i don't know which one. There's so many out there i don't know which ones are good and which ones are crap. help?