Thanks for the great posts. I just upgraded my dash speakers with the Infinity Reference REF-3032CFX. (I have one extra, if anybody is interested.)
I also ordered the Kappa 6x9's for the front doors, and I replaced the subwoofer with a Rockford Fosgate Punch P3SD2-8. I'm not sure the factory amplifier has enough power to really let the RF sub shine.
The dash speakers and sub already made a huge difference. I know people commented that they didn't think the doors would be as drastic of a difference. While its true that it won't be as big a difference, I've listened closely to the door speakers, and like every other speaker in this truck, they seem "muddy" and just not accurate at reproducing the music I want to hear. I know before I'm done, I'll have replaced all of them, Including the rear doors and ceiling. These factory speakers are just plain terrible.
I'll update as I go.
I have also purchased enough NVX sound damper material to line the entire cab and doors. If you've never used similar products, the results are incredible. I once gutted and lined the entire interior of a Toyota Celica with a 1500watt (rms) system and a single 15. It hit hard, but you could barely hear it, from outside the car, at full volume when the windows were up.
Update - 4-23-18:
Sonic Electronics upgraded my 6x9’s to the Kappa 931x. While they claim on their site that the fit, they do not, can not, will not fit the front doors, due to proximity to the window track. They will however fit the rear door, with just a slight bit of trimming.