I always like to underpromise and then overdeliver and I preach it all the time at work and it was the same with my weight.
I initially set my goal at 175, then 165, and I think I'm gonna stick with 155.
I might have a different mindset because I started so much heavier than you, but for me, it wasn't about a number, it was about getting healthy. The problem with focusing on a number is that let's say you do lose down to your goal, but then start weight training, or even just train different muscles if you are already doing weights, you will gain. You will be smaller, but you will also be heavier.
Started - 12/25/11 at 265 lbs.
ONEderland - 2/16/13 at 199 lbs.
Goal - Normal BMI! - 7/17/13 at 155 lbs.
Refocus - 1/29/15 - 185 lbs.