I'm aiming for 145 lb so that I have a 5 lb window to maintain in since my "real" goal is 150.
According to the BMI charts (which I don't fully trust), 150 lb puts me about 10 lbs above the "normal" range for my height, but I'm expecting that I'll have at least a few pounds of skin to take into account and I've got a fairly large frame, so I feel like going any lower than that would make me look sort of funny.
Though, honestly, if I can squeeze my butt/hips into a size 10 (or maybe even 12) before then, I'll probably stop a little "early."