Going to make and alt. Which power is the most FUN to play? My main is a fire tank so dont say fire. and yes, people can actually play for fun lol...
Whatever power set you like is the most fun to play. I don't think anyone can tell you which one would be most exciting for you. I personally enjoy being a Mental DPS.
If its just for fun and you aren't trying to top the scoreboards or anything, might I recommend an Iconic/Movement based build. Definitely challenging and its gives you something different to play around with.