As was mentioned, Rain of Blows is amazing, especially for a level 3 encounter power (fighter).I know there are better ways to build up the Tempest or Ranger than the 2 bladed, but I want it for fluff (and how I picture my character...so how I draw him as well). At the same time, I'm wanting to make him so that though the fluff is reflected, he's not totally gimped at the same time.
So far good suggestions and I feel like I'm going with the double sword. It looks like the party is about 14th level, which powers would probably go best with the double sword?