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Generally, you want your music from the speakers 'infront' of you: thus, the 2-way 6.5" component speakers in the doors.
The merit of having 6x9 rear speakers is for added bass (rather than a subwoofer per se). Thus, the reproduction of midrange/treble would be of little value to me. I would actually just add a 6x9" woofer (or two).
Have you upgraded the front speakers too, with decent amplifier? That would be my first port of call.
Having said all of that, both Focal and JBL produce good speakers in general. You could also look at Morel Tempo and Maximo series, and Hertz ECX and DCX.

The merit of having 6x9 rear speakers is for added bass (rather than a subwoofer per se). Thus, the reproduction of midrange/treble would be of little value to me. I would actually just add a 6x9" woofer (or two).
Have you upgraded the front speakers too, with decent amplifier? That would be my first port of call.
Having said all of that, both Focal and JBL produce good speakers in general. You could also look at Morel Tempo and Maximo series, and Hertz ECX and DCX.