$40 for a can of Freon? I think /not/.

So. I bought freon yesterday to try to get my AC up and running in my car. Then, I snapped out of my dream world and realized "Oh. This car is still set up for R12."

So, since I am not paying that much dang money to charge my AC, what all does it take to convert over to the 134? I've done some Google searches, and some people are saying that for the old Chryslers, all you need to do is change the dryer and the reciever. Then, there are people saying "No way! That's a complicated and delicate system and you have to replace everything!"

So. Some light, please, gentlemen?