I like the thought of healer myself. Make it focus on Dex (smoother dances = better healing) and have it fill in the missing HOT niche. If its a tank then evasion would probably not be the best way to go as one moment of bad luck would drop you. Active mitigation would be better, hit this dance to make threat and this one to reduce damage and what not so you don't end up with a dancer in plate mail.