Most Helpful Girl
That one poster about Stila is 100% right. That one is my favorite. I also use the Marc Jacobs liquid eyeliner and the Urban Decay 24/7 liquid liner. Those 3 will all do the trick. Personally, I think you can do with the Stila, it may seem expensive but it lasts you for a while.
Another thing to try is gel eyeliner. That gives you super black results. I believe Maybelline makes a really good gel liner.