Rob, here's my break down:
For Weathered/Rusty vehicles:
Primer: rattle can Plastikote (if it's not raining) or Vallejo Primer (when it's raining and I want to build)
Paints: Tamiya, Floquil, Vallejo Model Air
Flat Clear Medium (Liquitex, Vallejo or Golden)
For Shiny/Gloss:
Primer: rattle can Plastikote
Paints: House of Color, Auto Air Color, or lately Enamels thinned with cheap lacquer thinner (Donn Yost's method)
BLING: CLEAR FX or PEARL EX powders
Clear: DuPont Spot Acrylic Clear
Oh, all the paint work is done with either the Iwatas or the Paasche H if I'm using Enamels.
If I end up doing two tones or paint graphics, I tend to use HOUSE OF KOLOR.