Pedro,
I got a Pioneer w Ipod. Upgraded the door speakers with POLK audio components (DB6501). I left the stock amps, stock wires, stock rear speakers. It sounds a lot better. I started it myself and had it finished at circuit city. Bought everything at circuit city, they did a great job. Only one recommendation, ask them to leave the crossover for tweeters on medium, the treble is amazing and almost too crisp on high but you should listen to it before you/they set it to medium or high. Good luck, I am very happy with mine, though it is true that I dont listen to music during spirited driving but I do love great sound when I am cruising in town top down....ahhhh heaven.