For purely farming, HPala / rSham /rDruid (Pretty much any healer.)
If your planning on playing yourself, fDruid / sRogue
My personal opinion if your not sure what your gonna do, Roll a Druid, farm as healer, get healer + feral sets. Then play what you wish when you wish. Good things about druid is your pretty much every class type rolled into one with a simple respec you can be playing anything from a mage > rogue > priest. Love em.