I know you are focusing right now, but it really depends on how much money you have at that point, and what theme you are going for.
I've had an ultimate paint job the whole time (Black with flames), but my second choices have changed a bit over the years. A friend's '46 Plymouth was done in a stock Blue, my dad's 40 Ford Maroon, and even the current Gray (too much like primer with shine). Thought about Petty Blue, but the more I see other '40s online, a mild lighter color seems best. I don't need Resale Red or Screamin' Yellow on mine.