If you can find the plug for the factory clock, you have a constant 12V source right next to your HU. Yeah, don't install a pair of 1000w amps unless you plan on liquifying your organs. The biggest issue with putting huge audio into a truck cab is the inherent lack of space to work with and surfaces to install speakers and a sub (slimline internally powered subs are your buddy when getting a fuller experience from your audio gear in a confined space and you can get reasonable quality sound on a budget) Don't be scared of new gen audio gear. +DAB digital radios are freaking awesome and USB lets you carry a ton of tunes wherever you go, but I still prefer a disc player as an option. Kenwood is a good go-to for a HU but I can't stand Pioneer or Sony stuff (once they both started cheaping out by moving to Malaysia & Indonesia, it turned to crap)