Nightbane

[Mirajj]

For Aran, specifically, lacking a warlock is a significant loss but not immediately fatal. I don't know much about your group's composition, but it obviously has a hunter since you're in it. Scour the AH for some mail greens "of Frost Protection", then at ~42%, feign and macro-equip the entire set. Once the elementals pop, immediately shift focus to firing on the elementals and drawing their aggro towards you (click off Salv if you have it). Especially with a control strategy, there won't be any pressing need to have DPS on Aran while the elementals are out because you've presumably forced the poly earlier. With ~250 or greater frost resist (a paladin or shaman in your group can raise your resists easily, and a Magic Resistance potion works well if you don't have either of those), the elementals will all fire waterbolts at you and inflict very minimal damage. With all the stamina on the "Frost Protection" gear, you'll be very easily healable, and all you need to do is outaggro healing threat split five ways.

Yeah, this is what we'll be looking at this week for Aran. I've been saving any resist gear I've found as I've tooled around the Outlands, and have a decent (but not great) set so far. Should be interesting.