Gaticus

I'd recommend either Rad or Dark, just 'cause they both have a really fun variety to the mechanics of their powers, so you kind of get a lot out of playing them. They also happen to be really powerful sets, which is sorta icing on that cake. I also have a lot of fun with a traps defender, but it's... weird. I find myself using my secondary a lot while things are on cooldown. I might try it as a Corruptor, see if that flows better for me.