Well, with baby backs I actually sneak closer to 250 where spares for me do best at 225. Anything within this range will yield very good finished product with regard to taste, texture, and level of smoke.
Remember that you're not dealing with tough or overly fatty meat with baby backs so you're not looking for overly long smokes ... you want them in that window. I'm not an advocate of foiling in the Smokin-It but you can certainly use the 2-2-1 (or 3-2-1 for spares) and have outstanding pork; I think the moist nature of these chambers yields a great product without the benefit of a foil crutch ... but your mileage may vary.
Apple or cherry are my favorite woods for this prep; with baby backs I wouldn't do but 3 oz or so.
Be sure to post pics of your inaugural smoke!