I have changed mine a few times with changing mind sets - when I first started loosing a few years ago I dropped down to 110 pounds (50kgs) because I got caught up in skinnier is better.
This time around (yeah...I gained a few and gained health back lol) my goal is 135 - 138 pounds (or 61-63kgs) which is where I am currently sitting. I'm 5'6 and a definite pear...big hips slim upper body so this weight works well for me. Even at 138 I have defined muscles. My goal is for fitness rather than just being thin.
Having said that I am still a US 4-6 (Aussie 8-10) and quite happy with it
Anyway...thats my rambling way of saying yes...I did change my goal weight lol and some of the reasons why!