I wouldnt worry about the rears too much. Just a decent set of coaxials should be fine. Ideally, its better not to have too much high frequency coming from the rear. But depends if your trying to build a live front stage sounding stereo or a surround sounding stereo.
I did a set of 6.5" type r comps in the doors and mounted the tweeters on the door as well. Ive questioned now whether I should have made pods for them in the a pillar now. But ive already drilled the holes in my door, so its a little late for me to change it now haha. I wasnt going to run any rear speakers, but I ended up getting a great deal on a 4ch amp so I am currently just amping the stock speakers very lightly.
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2011 Kona Blue MT82 V6 Mustang Pony Package 3:31 Gear Ratio, Interior Upgrade Pkg, Security & Shaker500/Sync
Mods (in order of installed): AM Bama SCT SF3 Tuner w/ 87 Hybrid Tune, Airaid CAI, Hurst Billet Plus 2 Short Throw Shifter, Lethal O/R H Pipe w/ Stock Exhaust, Blacked-Out Tints on Rear Windows, Full Ceramic Tint on Front Windows, Metra Touchscreen Dash Adaptor, Single DIN Head Unit, 6.5'' Component Speakers Fronts, Stock Rear Speakers, 10'' Sealed Subwoofer, 4ch. and 1ch Amplifier. LED licence plate lights, LED interior dome lights, FRPP/Dynamic shocks and struts, SR Performance lowering springs, GT500 Strut Mounts, BMR Adjustable Panhard Bar, BMR LCA's, BMR Relocation Brackets. Rear Seat Delete.