Ele58/ Pyro 18 is a very fun build atm. Good DPS and easy to play. Guide here.
I even use it to solo at level 70, with very few changes.
- Build: Frostkeeper 0 instead of Dominator 0 for legendary Rime (auto self heal). In Pyro move a point from Stoke the Flames to Flicker (optional, but I like the mobility).
- Use the rock pet with Synergize
- Make a copy of the Nuke macro, and remove "cast legendary neural prod"
For combat I send the rock pet to hold the mob(s) in place for my Firestorm and use the rotation from the guide above. It's beast!
(If it's easy solo you can just use the rock pet and synergize with the standard build. Stuff dies FAST)
PS: this is not a build I'd try for leveling... it really needs those legendary skills unlocked -- in other words, level 70. A Harbinger/Chloro offers much more survivability for leveling.