I am doing this install right now. I'll see if I can make a few copies of the installation manual I have. I have been meaning to to that but that's another story.
The $200 you spend on the old dealer installed A/C will go up by another $100-$200 plus the cost to have the system tested for leaks and charged.
You will (SHOULD) buy a new drier, belt, and hoses. A new compressor is a good idea but not an absolute. I went with a Sanden 508.
You will need to cut a big chunk of engine shelf out, cut a large hole in the front trunk, and drill some holes. That is a very short summary of what you need to do.
MAKE sure you get the pulley behind the fan on his engine. You will need that pulley. If the motor for the inside unit is on the passanger side and not the middle of the unit you will more then likely need the small idler pulley attached to the engine. The idler pulley for the other model is attached to the A/C compressor bracket.
I am sure others will chime in on the parts I left out.
Contact me if you have questions or need any help locating parts.
Kerry
I forgot...........Nice car