I use the 263 brush for the fluidlines; it is thinner than the 266 so I am able to get a finer line. I also like a straight edged push-brush; I use an art brush that I got from Michael's.
I love the 209 for the fluidlines. For foundation the 190 because I like a really matte look, I've heard that the 187 is great if you want an airbrushed look.