Yes! Put your tweeters in the A-pillars
I can't describe in words how much it will improve the soundstage
Nothing in the rear at all?
If you went to a concert would you stand with your back to the stage?
Your want your soundstage up in the front-end, where anyone would be facing when sitting in the car.
A simple but decent set of rear co-axils will provide you with sufficient rear fill, so that the back isn't completely "empty".
Anything too powerful is going to disrupt the soundstage, creating more noise than music.
I have had these since I first upgraded from the standard speakers, almost 3 years ago, still running sweet
They aren't even amped and don't need to be
I have recently upgraded my front-end to competition level and had some matching-work done on the rear to bring the co-axils out from behind the nasty renault plastic