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...your tires probably won't stay white if you ride the bike, so I'd go with what pleases you.
Personally, I like the metallics you can buy now, but the solid colors (with no metalflake) are easier to apply smoothly.
"Vintage" covers too much territory to give you much guidance, but
Velo Mule is pointing you in the right direction.
Most of the really old bikes I've seen came in black, or in black.