Elemental mastery, ~450 spelldamage (with trinket), Chain Lightning crit x4 and potential Lightning Overload x4.

I'd have to do some numbercrunching to get a good figure of my average CL nuke, I can only guess right now, but with some luck I reckon I can hit for more then 10k. xD Probably 6-7 average though. Not sure. *shrug*