Yep, OPI is great, but TBH, I really find that the only way to make a nail polish last any sort of distance is to use a top coat. I know it's a pain, but I just do my nails while I'm reading in bed, and then when they're semi-dry I turn off the light and go to sleep! Only way to do it with a toddler

ETA That Revlon one that Kellie is talking about is really good too.