I have the same problem. I've tried a MILLION different kinds of mascara. I have super long lashes anyway so EVERYTHING shows up on them and I'm really picky about clumpiness.

I would have to say it's between L'Oreal Paris Voluminous Curved Brush Mascara (haven't tried it in waterproof) and CoverGirl Lashexact Waterproof Mascara. This mascara clumps the least out of everything I've tried, and its great for multiple purposes, you can apply a little for a nice, natural look, but you can still achieve seriously glam lashes by adding more!