The cost of paint has skyrocketed in the past few years. Just be thankful you are not painting your car red, as this color costs the most. I used Dupont Chromabase two stage paint on my Highland green GT/CS, and it is wonderful. I also paint my Model T's with Dupont Centauri, which is a single stage paint, and it is also great.
The thing I learned about painting is that the top coat is not really the most important thing, it is the preparation BEFORE the final coat of paint. A great top coat will look horrible, if the body shop doesn't take the time to get the car's panels straight and aligned. When you take it to the body shop, stress that you want a straight car and that you are a perfectionist!!! Once said, the body shop will understand that you want the paint job done right. With labor costs and paint costs what they are, you can expect to pay $5000 and beyond for the right job. Keep in mind, you will get what you pay for, and a $800 paint job will look like an "$800 paint job".
Also, if you want to have your car judged by MCA (I read the other post on this subject today, and MCA judging is obviously not for everyone), keep some "orange peel" in the paint. If you color sand the car and buff the paint to look like a mirror, your car will have points deducted for the smooth finish.
Hope this helps,
Russ