yeah, I have comps up front and coaxes in the back, but I think the OP was looking for a specific pairing of speaker sets.
my opinion on just fronts versus rear fill is the car and whether or not rear passengers are in the car often.
in a 2 door car or a small 4 door, I would forget the rears. In a large 4 door car, it depends. I turn my subs off at night so I don't wake up neighbors and what not, so the rear fill is nice. I also have people ride in my back seat fairly often so the rear speakers help the sound for them too.