nice to see another member w/an escape //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Do the big three first, is pretty inexpensive and easy to do, theres a sticky somewhere on here about how to do it. Not sure about the 05's but i know the alt is a ***** to get to on the 03's, that would be the only somewhat difficult part.
the battery would probably be next to do after that depending on your voltage, which is also pretty easy to wire up.
Have you checked to see how much your voltage is dropping when playing full tilt, while driving/idling?