Revlon Colorstay Liquid Eyeliner ($6-7)
MAC Liquid Eyeliner in Bootblack ($15)
Both of these liners are fast-drying, smudge-proof and are rich in color. I've tried both and they pretty much seem the same to me except I have an easier time applying the MAC one because I've used it for several years. Both products have felt-tips that make lining eyelids quick, easy and neat.