Well Aplines are ok, the reference series I know little about. I personally went with Memphis Audio M Class speakers, both the 6.5in and 6x9s. Your factory speaker locations will always look stock given how they are hidden behind the door panels and rear deck cover, so no worries on messing that up

But you are right, you want more high end (trebble) and mid range bass for the fronts and leave the bass in the back. That way you get a nice all around sound from them.

You will probably have to do a little dremeling of the speaker holder, if they are anything like the 97-03 GPs. There will be a plastic holder that contains the factory 5in speaker. You will need to carefully dremel it out to mate with the larger 6.5in speaker, but its not a hard task to pull off and still keep things custom