I think I'm down to those 5 as my candidates. I'm level 44 and probably still an early game player...in the campaign I've completed all 252 stars on Normal, Hard and Brutal, but I'm only on stage 4 of Nightmare. Hitting 3.5mm on lowest level clan boss. Stage 10 to 13 on all of the dungeons except for Spiders and Fire Knight (level 8 on both of them). Silver I in Arena. 

Still at a point where I'm looking for a good multi-use champion since I still have a lot of content that I'm trying to get through.