I cant be 100% sure on the price as most of it was a gift from the wife, but the head unit + Sirius+HD Radio+ Steering Wheel Remote+ USB extension +Wiring Harness .... Should come to about $950 or so, maybe less.. Obviously you can mix and match a bit as most wouldnt want ALL of those features.

It does wire in to the factory amp without issue, I chose to use the RCA line outputs and to add a seperate wire for the rear speakers but that is not required. Many other threads on here give a lot more info on the actual wiring side, this one is not much different than other models in that area (other than the before mentioned illumination wire)