Zeta crossroads

I'm in a similar situation where I have Zader with about 30 zetas burning a hole in my pocket. I have clones, kylo, sith (old and new) other FO all as options for zeta and gear focus. I like utility like Zader where it's helpful in multiple areas of the game ... too bad clones suck in arena otherwise they would be the easy choice.

Nihilus is new and looks amazing ... zidious looks good as well. Zylo is pretty beast but haven't seen or can think of an ideal team outside of FO. I stick him in my current Zader arena team but he's there just cause he's cool not cause he's got any synergy. Gah too many choices which is great but zeta being such a grind would hate to waste