My goal weight is somewhere between 100 - 110lbs, I guess that when I get to the point somewhere inbetween the 2 that I feel right I will stop. I also am 5'1'', and I have a small frame. I am now in a UK size 10, which I think is the equivalent of a US size 6, and I weigh approx. 140lbs, so I guess that when I get down to my goal weight I will take a size 2-4