I just did a 4lb brisket this weekend, and I pulled it off at IT of 160, and double wrapped in foil, and put back on the smoker until it got to IT of 195. I think you'll get more moisture this way (in my experience anyway).
Once I pulled it off, I left it in the foil, but double wrapped in towels, and put in a cooler for about 1.5 hrs. Was the best brisket I've done so far. Good luck and make sure to post a qview when you're done!