N00b here. Just seeking some advice on speakers/amp. I recently decided to start building my system in my colorado crew cab and so far I have the pioneer fh-p800bt and I just got the polk db6501 for the doors. I will definatley need an amp for the polks and won't even other installing them until I have one. I'm also wanting to replace the rear door speakers as well. My question is what would be better to run in the rear doors, the db651 or another pair of the db6501? Also, depending on which route I go what size amp will i need? I've been searching 4 channel amps and the only reasonably priced ones seem like they would be underpowering the db6501. One of the amps I've looked at was the gm-6300f which is 60x4 @4ohms. Is that enough for the db6501?