New here, although long time lurker, and I'm late to this party..
However, it would have to be two stage, and I've had numerous cars painted from paint to sell, driver quality through concours level. Understand some like single stage, especially if they're restoring for "originality," but a good base coat/clear coat job is the way to go. The old colors really pop w/the modern chemical formulas, repairs are more forgiving and easier to get a good match, and for a metallic color, 2 stage is the only way to go. It also allows you to build the clear coat, wet-sand and buff numerous times for a desired gloss with-out fear of cutting into the color.. scratches can easily be buffed away if you or your paint or detailer knows what their doing.
Although many have consolidated, there are still a number of good brands to choose from as well, Glasurit, Sikkens, Spies/Hecker, PPG, and some of the other BASF lines.. in other words there are options that can save you some money and deliver a nice finish. Single stage is great but it will never look like or equal a quality 2-stage job.
Good luck whichever direction you choose!