Fingers and Toes nail salon in Mill Valley first turned me onto this nail polish brand, Zoya. I was naturally drawn to the rich hues and color choices and didn't realize until I did a little bit of research that Zoya polish is all natural, Toluene, Formaldehyde, Camphor and DBP (dibutyl phthalate) free too!
Besides having great colors this line is exremely long-wearing and durable. I love the mossy green metallic called Irene. Or, the bright-neon orange called Paz and Ki, the plum with green metallic highlights.
Zoya also offers each of their collections in sample sizes ($35) so you can try more colors economically like this Candy collection from their line. Available from zoya.com or amazon.com (and I'm sure many other places!).