I have been running Widget the Departed, Gooey Sha-ling, and Gilnaen Raven with very good results. I did replace the Raven with the Dread Hatchling, and I really love the heals! I like using Gooey Sha-ling as my setup/damage dealer. He will cast Death and Decay (adds more damage), and then darkness or whatever order makes the most sense at the time.
I like his Seethe skill to counter mech type pets out there. Widget is just awesome, and the Dread Hatchling cleans up the mess. Its a very good team, and I love using it in PvP