Help choosing class

[Vecks]

Hi everyone, I've got one more open slot and am having difficulty choosing a class. I usually play high dps and reaction speed characters, and I already have a kfm and an assassin that I really like. I was considering a soul fighter, a blade master, or a force master. I don't like blade dancer or destroyer so please don't recommend those. I don't want something too easy, as i could get bored and I don't really like tanking, but I was told I could build bm with decent dps. Which class should I choose?

thanks a ton!