Heres a basic audio/video install I did a few days ago. I was impressed on what she was able to purchase within a $650 budget.

The headunit is a JVC with a 3" lcd screen and plays dvd/cd/mp3 files. I also added a CD changer under the passenger seat I didnt get a pic tho.

The Front speakers are Alpine Type-R Coaxials. They needed the included adapter plate to clear the window motors. They offer impressive sound even with the stock crossover system still in place. I glued the crossovers in the doors and soldered every connection point to ensure corrosion wouldnt reduce the signal quality over time. note the wires are bound and routed along the bottom of the door to avoid getting caught in the window gearing.

The rear speakers are Type-R coaxials which because of the stock crossover system, only produce bass.

The amp is the Alpine MRD-f345 75wrms x 4 channels. The crossovers are not set because of the stock crossover system. She may later have me bypass the stock crossovers. It is grounded to the seat bolt (of course sanded) via 4ga wire.