I would go with the JL 500/5 amp, simple and you will only have to hide and mount one amp, under the seat or the other half of the back seat. A lower end Fosgate, JL, or Kicker woofer would sound good, down firing need to take a beating. As for highs, I have always loved Boston Acoustics, I heard they were bought out but hopefully they have the same quality. Either build a plate for separates in the front and back or go with some good 6x8's. The Alpine speakers are a good choice too, it is best to just go listen to some displays, everything is personal preference and your actual budget anyway.