L'oreal is probably my favorite brand for mascara. I have about ten mascaras, but I use these the most. I like all of the ones I've tried by this brand. I do have pretty long lashes naturally though, so it might be easier for me than others to get mascaras to work right, but still I think these are the best. Here are the ones I have and like. First is L'oreal Voluminous. Great for lengthening and thickening, though slightly clumpy if you put on too much. Check out how it looks on my lashes below.
Definitely pick out one of these mascaras if you have a chance.