My old faithful, Maxfactor False Lashes. We've been together for years and have a great relationship. I buy the black waterproof (which is really very waterproof!) To me it's the perfect consistency and so avoids any clumps, even on the third coat. And the brush is great - a plastic small spike chunky brush that spreads my lashes correctly and applies the appropriate amount of product.
If you're looking for a new mascara I think that you've just found it!