Number 1 has to be Bare Study, then Groundwork (for more depth) and Indianwood. I like to mix Painterly with Groundwork - I find it just slightly chalky on it's own.
I heart Rubenesque! It's like melon pigment, but in paint form. Also, it's not strong enough in colour to change the shade of e/s you put on top of it. Other than that, I'd agree that Bare Study or Painterly would be the most versatile.