DK. My backbar is kinda full, since I like the skills I have slotted there. The only skill I would consider changing is Absorb Magic atm.
try it out on a cpl of runs with out the skill, as a DK i dont think it will be as much of an issue compared to another class.do you find your having stamina issues with blocking?
the mini shield from deep thoughts is convenient, the biggest draw is the regen.