Luscious Lashes

I need some new mascara and I'm wondering if anyone has a favorite. There are so many choices and its hard to know which one is good. I hate spending money on any kind of makeup just to find out I don't like it. At Sephora they sell a bag full of mascara samples so you can try them all and pick your favorite. It's called LashStash. How witty is that? I think its a great idea but I figure I can save myself $39 and just ask you. The most important mascara features for me; doesn't clump, doesn't make dark circles, and isn't too expensive. Thanks!