When I go completely stock (like I'll eventually do for a '32 Vicky, '37 Chevy, etc.), I certainly won't use any metallics, and by that time (another year or so) I'll probably have built up some stocks of non-metallic paints for those efforts.
Do you describe your painting process anywhere on this site? If so, I'd love to read it. For me, painting the body is the real challenge when doing car models. Most of the rest seems fairly easy, all things considered.