I've been spamming Heroics with friends to get ready for Mythic next week and have been toying with different Builds.
My current favorite is ......
Echo, Aftershock, Spirit Wolf, LMT, PE and Stormkeeper.
It's got crazy variance since I go from double the DPS of the rest of the pack to dead last in one pull but I found it better than some of the alternatives. They seem to have stable yet very mediocre DPS overall. I'll live with the lows of bad RNG with Aftershock for some level of fun.
I also found my Mastery was too low currently to really use High Voltage and Unlimited Power.
What's everyone else been running and why?