I've been playing around with a few different types of markers. So to totally geek out, I've been using a ShinHan Touch, a few Prismacolors, Tombo, Faber-Castell, and a Copic. I'm going to have to go with the ShinHan Touch. Basically because it leaves a clean mark, doesn't go through my sketchbook paper, and perhaps most importantly the cap goes on the end. Ok, maybe that's not the most important but it's a big plus for me.