Like you Brian I used Dupont Centari over the years and had good luck with it until a few years ago. The last 2 paint jobs I did with it just didn't come out well.

I talked to the guy at the paint store before I did my wife's car a couple of months ago and he recommended I go with a urethane. I was really happy with the way it went on and the way the paint job turned out. Another plus was that it was cheaper than the Centari would have been. If you want I'll dig up the brand name for you.