Also, probe each piece of meat separately if you can. If you only have one thermometer, I would use it on the lower piece, first. The bottom one will get more direct heat than the top one. I had a 4-hour difference in cook times yesterday between 2 virtually identical pork shoulders.
My #2 is only a week old, and I haven't had a chance to try a brisket yet, but it's one of my favorite BBQs. Whatever wood you decide to use should taste great. Good luck, and don't forget to share the results!