i'm not very familiar with waterproof mascaras, i remeber trying two of them so i'll suggest them both, i like them both.
The first is Urban Decay's lingerie and galoshes, it's actually a double ended mascara, one for the white base, the other for the clear waterproof part. Great if you love your regular mascara and want to waterproof it. Sadly no more available in France.
The second is the one i use right now, and it's good. It's the new Makeup Forever aqua smoky eyes mascara. The only thing i do not like is it only comes in black.