I cant recommend DSI Vipers enough. They are extremely comfortable, give great support to the ball of your foot (for direction changes) and are extremely light. The twin sole gives great flexibility in the foot for dance, and the tread patten under the ball of the foot really supports you during direction changes.
I wore them from 2009-2011 at bluecoats. and 2012-13 at minnesota brass (my 2011 bluecoats pair, still going strong after 3 years)