I am also 5'11 and am on the larger framed size. i am the definition of big boned.. hah. anyway my goal weight was originally 160- because thats the lowest weight i remember being in my adult life, but at a current 184 and feeling as good as i do, i have changed my goal to 170. i feel that will be easier to maintain for me then 160. What is most important is how you feel at your weight. if you are comfortable, confident and healthy - thats all that matters