I went with Infinity all around the vehicle for speakers, they are fantastic. Here is how I did MY infinity setup.
For the door I put Infinity Kappas 693.7i 3-Way 6x9s (100 watts rms)
For the rear passenger area I bought Nazars speaker pods and went with Infinity Kappa 63.7i 6.5" Coaxial speakers (75 watts rms)
For the dash I went with Infinity Kappa 32.7cf 3.5" speakers (35 watts rms)
I did not amp the dash speakers as the D3 is only powering them, they get plenty of watts from it.
The door and rear speakers are powered by a Alpine PDX 4-Channel 400 watt amplifier.
Here are links to the speakers I used.
Infinity Kappa 693.7i 6"x9" 3-way car speakers at Crutchfield.com
Infinity Kappa 63.7i 6-1/2" 3-way car speakers For 6-1/2" and 6-3/4" openings at Crutchfield.com
Infinity Kappa 32.7cf 3-1/2" 2-way car speakers at Crutchfield.com
