[Lynn]

Well, I believe I am going with transtar 6244 (a 2k urethane which is same as 6221, 6224, 6231, 6234, 6241, just different sizes and colors) which will be going over some acrylic lacquer primer (transtar product) which is sanded so thin you can see through it in places. I am going to let the 6244 cure a week, then wet sand with 600, then 1200, then shoot another coat for one more round of wet sanding. Although I painted several cars back in the day, this is my first black repaint (full car any way, shot a couple of panels on an older black BMW about 10 years ago and they looked factory).
Black has to be perfect, so that is why so many steps. If I see a sanding mark in the finish, I will start having puppies. Cursed with the perfectionist gene. And I have the same brand "paint booth" as you Mike. So... I need to be able to sand out the tiny specs of dirt and bugs between steps.

Transtar Tech sheet says it "is compatible with most basecoat/clearcoat and single stage systems" for topcoat. Guess I should be ok with lacquer. I will test on a spare piece of metal before trying it out on my car. I submitted a question to transtar tech support, and will report back.

Sorry again for hijacking the thread. While there is a huge amount of information out there on painting, it really gets thin when you start looking for a very specific recommendation.