OOOhhhhh!!!! I'm such a make-up geek! lol!
Okay, so if you want an amazing black liner that doesn't budge, my ALL TIME favorite is MAC's fluidline gel liner in Blacktrack. The only catch is that you need a liner brush to apply. But it is sooo worth it and goes on soooo well...
If you're looking for a pencil liner, I highly recommened the Urban Decay 24/7 eyeliners. They go on sooo smooth and stay put all day. When I don't have time to fuss with my fluidline, that is the one I go to. I have their black liner in Zero but I want to get their blackest black eyeliner in Perversion... Wish I had a Sephora new me...