painterly (base for neautrals and highlight colours)
rubenesque (base for browns and golds)
green stroke (greens)
blackground (dark looks)
fresco rose (base pinks and purples)
I like Painterly (for a nude base), Bare Study (for a shimmery neutral base), and Indianwood (for a bronzey/golden base). I've got to get some more colored ones though! I want Mosscape, Deflt, Fresco Rose, Artifact, Greenstroke, and Quite Natural.
It depends also on what kinds of colors you wear most often...for example, my first two p/p were Bare Study and Artifact, because Bare Study can be used under pretty much anything and Artifact because I wear a lot of purples, reds, pinks, and browns.