For airbrush, probably something liquid or very soft-bodied. I hear a number of folks prefer Creatix or Monster Kolor. Model paints like Tamiya, Vallejo or Citadel seem to be common go-to's also. Tamiya being a bit more premier in terms of model paint. Have fun painting!
I was wondering if anyone has suggestions for what color paint to use to touch up the standard green. My S1 Invader has a scrape on his head which I can happily cover up as he's not going to leave my collection, but I figure someone has an exact color match for it? +Hitoshi Mitani maybe?