I was always told 160 F. Remember too that if you go to hot like 200 F for too long you could fat out your meat. I always start out with my smoker at 145 F pre heated. I let the meat hang with dampers full open for an hour or till its good and dry to touch on the casing. After an hour i raise it up 10F then 10F every hour till i get up to 180F. I use a dual probe thermometer to get a better idea of the temps in my smoker. Once i get to 160F i pull it and give it an ice bath. then hang for an hour or two. Rytek Kutas book from the sausage maker is the best book i have read on this stuff.