Dammit, I hope I'm not too late for this...
Since every comedy needs a straight man, I was thinking of a Warblade focusing on Diamond Mind.
From what I can ascertain from the OP, the difference between this system and more traditional D&D is simply that the players tell the DM what they do, and the DM rolls for them. Is this correct, or am I missing something? Please bear with me if this question sounds stupid, I've been up for a long time and the caffeine is beginning to wear off...