These colorful muted shades have been on constant rotation in my manicure line up. I've tried plenty of polishes and find that the best pastels are those that aren't too sheer; and don't require several coats. Deborah Lippman, Butter and Jinsoon all make great colors and although on the pricer side, definitely get you plenty of bang for your buck.
On the more affordable side Sally Hansen, China Glaze, and Essie all offer hundreds of shades and can be found in the drugstore. I've worn Sally Hansen since High School and find the Xtreme Wear line to be the best chip-free polish!