i have 94 Infinti g20. i have infiniti refrence 4x6 in the front. stock rear speakers. kenwood head unit.

I would like to get good sound but loud enough to hear when the windows are down on the highway. so i'm thinking components in the front, 6.5 i hink would give great sound. a more the 4x6 to the rear with hopefully a mounting plate of some sort and a 4 channel amp.

i'm looking to spent $150 for the fronts and $200 on an amp. any suggestions?
i was looking at JL or Alpine but not sure what the differenence are between the speaker. some go got $80 and goes all the way up to $300. I'm looking for feedback and i dont mind buying used equipment if that gives me better selections