I'm thinking about taking a few dailies that create marks that last for the whole encounter (There are a few), or the Cleric's Tactical Warpriest (Or the Warpriest in PH2) for a decent marking feature that lasts the entire encounter.

Maybe I should combine both?

Also, Tegu, I know you have a build based ont he same shenanigans. What route did you choose for furthering this build?