according to my car: for the AC you need only the compressor, bracket, bolts, the 3 A/C lines, pressure switch, and controls.

look on your firewall just inside your passenger strut tower, there expansion valve going into the evaporator should be there.
also look under the center of your bumper you should see the condensor and dryer. (my car has both)

I also just last tuesday when i picked up the chrome rings and such to add the fog lights, had them cross reference the compressor with the earlier cars, and it has the same part number (mean a rebuilt one for $100 instead of the $600 at the dealer.. Although he could not confirm the mounting bracket (separate piece) was the same ( and i haven't checked to see if it was on the car as a complete accessory bracket or not). but the old lines will work too.

buy the factory fog lights to put in, and then run your own relayed harness. the lights are @ $60 each side from GMpartsdistributor.com and then the chrome rings to make it look factory are another $30.

I have not looked in to the cruise, i like driving too much but i will be getting around to it soon enough.