I've been thinking about the same thing for the last 25 lbs or so.
I set my goal high because I wanted to feel like it was achievable. And I did achieve it. And that was on Memorial Day.
I've decided every extra pound is "bonus" weight loss and I won't be upset wherever I wind up from here. I'm on a doctor-supervised diet and will up my calories in about 2 weeks and I'll see less of a loss each week.
I would like to maintain below 155 lbs if I can. That's my new bonus goal. But if I wind up maintaining at 160, I'm cool with that, too.
I would say wait and see how you feel at an "overweight" BMI. Then see if you're able to get to "normal." But if you settle somewhere in the "overweight" BMI, I think it's okay as long as you are active and eating well