I like doing turkey in the WSM at 325-350. Cook to 165-170 in the thigh. I brine the turkeys I smoke in a brine of equal parts salt and sugar/honey, and after I take them out of the brine I let them rest in the fridge for 2 to 3 hours to let the juices redistribute and to air dry the skin. Then rub up real quick and put on the cooker breast side up. If you put it in a pan you can reserve the juices for gravy. If you like, you can ice the breast for a bit before putting on the cooker to lower the finished temp of the breast (it finishes before the thigh), but I've never had a dried out breast of turkey that was brined and cooked like I mentioned, the brining keeps it moist.