I'd probably want to bring the dark meat to 165 just to be safe. That's the FDA's recommendation. You might be able to get away with 155, but I'm not sure. This can be a subject of pretty intense controversy, so do your own research and figure out what you think is best. My thinking is that the leg meat has a lot more fat in it, so it doesn't dry out quite as easily if you cook it to a higher temp, at least in my experience. So what does it hurt to take it to a higher temp just to be safe? I baked a turkey in the oven on Sunday and made the mistake of relying on that dumb white plastic "thermo" they come with. I took the IT when it was done, and the breast came up to 180. The breast was a little dry, but I just spooned a bunch of the drippings over it once it was cut and problem solved. Anyway, my point is that taking the dark meat to 165 IT isn't going to leave you with lousy dark meat.
Last, I'm just a hack when it comes to food safety issues, so my tendency is to err on the side of caution. So knowing that, give my opinion the weight you think it deserves. I'm just one guy.
I've smoked mine hot. 300 and above. So really I'm cooking it the same as I would in an oven, only in my smoker. I figure if that works in the oven and produces tender turkey, there's no reason it won't in a smoker. And that gives it plenty of time to absorb all the smoke it's going to absorb anyway. Going low and slow might give you better results, but I don't really know.
If you've got an electric knife for slicing, use it. Because the breast meat is pure white, you get a really cool looking smoke ring. The cleaner your cuts are, the prettier the smoke ring will be. Assuming you're not using an electric smoker, that is.