According to makeup artist Bobbi Brown, the secret to good makeup is not more expensive makeup. The secret is natural-looking application with a set of good makeup brushes.
I'm a lot more comfortable with wearing makeup ever since getting a set of brushes--my makeup looks less chalky, and colors blend more naturally.
Plus, I feel like an artist!
Sonia Kashuk's Hidden Treasure Brush Set contains all the basics--brushes for eyeshadow, blush, eyeliner, and concealer. There are a total of three brushes described as "eyeshadow brushes," but the smallest one also works well as a brush for lip-color.