That is the weight that I feel my healthiest at - and I know I can achieve and maintain it with regular exercise.
The healthy range is really wide. If I were to go to the lower end for a goal, I would only be frustrated. Plus, I've never weighed less than 145 as an adult, so I don't think that 125 (or a BMI of 19) would work for me.
If you've been at your goal weight in the past and felt good there (and clearly it's in the healthy range for your BMI) I would think you're good to go!
Congrats, Cassie, on your 8 lb. loss. You're on your way!