I honestly think it is Sinful Colors. I have tried the gamut of nail polish brands and the only one that doesn't chip is sinful colors. I know there was a study out there and they ranked it as the best. The colors are limited.... but man, my home pedi lasted me over 2 weeks!
What is your favorite nail polish brand?
Oh, and I have 4 OPI minis and a clear top coat in the bridal theme collection that was given to me as a gift. I am not interested in the colors. I'd be happy to mail it to anyone if you send me about 4 bucks for shipping.