don't go to BB, CC, or any retail store
shop for a headunit online or eBay
1) not sure
2) spend yoru $$$ on speaks, if you're on a very limited budget the Pioneer Revs will do ~ $100, or go for the Crystal SSCs, or higher up look into Rainbow, CDT, Diamond, et al. and a separate amp to pwoer your speaks. you can leave the factory 6x9 as rear fills
3) headunit...stick to Alpine, Pio, Eclipse, JVC...again buy online or eBay
shop for a headunit online or eBay
1) not sure
2) spend yoru $$$ on speaks, if you're on a very limited budget the Pioneer Revs will do ~ $100, or go for the Crystal SSCs, or higher up look into Rainbow, CDT, Diamond, et al. and a separate amp to pwoer your speaks. you can leave the factory 6x9 as rear fills
3) headunit...stick to Alpine, Pio, Eclipse, JVC...again buy online or eBay