Ok first the quickest. Fast and dirty, white base, all contrast, wash.
The longest, basing black, glazing up to the colors i need. (already know im not doing this on an army. only on my characters/vehicles) the werks
Then my personal favorite, the cheater. black base, zenithal, nuln oil,dry brush over oil(doing it this way "forces" a shade/highlight, then using contrast/glazes, highlights, drybrush if needed (is a good midway between the other 2 methods)