Yes... we all know it can be done cheaper by buying the parts by themselves, and so forth. And yes, another half dozen people will jump in saying so. Scorpio, I understand your attraction towards having it all in one bolt in package, makes life easier that way. Now, to answer your question: I have the dual piston calipers up front and the Cobra rotors in the rear. Love both mods. The dual piston calipers is a direct bolt-in, super easy install. The pedal is slightly mushier afterwards, but it is not noticeable unless you're looking for it/expecting it, as I was. Not to mention I need to replace my lines.
The rear... yeah. I had to modify my ebrake cables to get everything to bolt up, as they did not clear the stud on the relocation bracket. Then, after that, I had to tie back the brake lines against the sway bar to keep them from rubbing against the insides of the rims. Great upgrade as well, just know what you'll be getting into.
