Sket Daaaaance. I love Sket Dance. Well, admittedly, I haven't seen any of the anime, but it's currently the only manga series I'm buying and collecting. I will always be a huge fan of series that are largely over-the-top comedy with the occasional GUT PUNCH that makes me bawl my eyes out.

And Kaiji is an awesome series! Though I never got around to watching season two. I need to do that. Eventually.