Please don't be discouraged! (especially by one of my posts!!) I agree with Jessica/Paperclippy's post. The only "normal" for metabolism is what's normal for each of us as unique individuals.
When you reach your goal weight, you'll experiment and find out what calorie level and exercise works to maintain your weight loss and that will be what's normal for YOU. It doesn't matter how many calories other people maintain their weight on, it doesn't matter what they eat, and it doesn't matter what kind of exercise they do (or don't!) All that matters is what's right for you.
Frankly, I couldn't care less about other people and their metabolisms! I know what *I* need to do every day to keep the weight off and that's all that is relevant to me. Maybe I eat a little less and exercise a little more than someone who was never obese -- but so what? It is what it is.
It's wonderful that you're thinking about maintenance now but please try not to worry about your maintenance calorie needs quite yet. Your body is going to go through tremendous changes between now and then. It's certainly an adventure!
As for maintenance being harder than losing -- to me, maintenance is the same as losing. My life today today -- January 20, 2010 -- looks just about like January 20, 2002 so far as what I'm eating and the exercise that I'm doing (I went to the gym, did the elliptical and a back workout, and came home to egg whites and oatmeal

). I've been at this for almost nine years now and everything I do for maintenance is second nature and just about effortless at this point. Right now, the time while you're losing weight is when you're learning the skills and strategies that will let you keep the weight off for the rest of your life. Trust me, you're going to be a pro by the time you reach goal! So please don't be discouraged and don't worry about maintenance -- like Jessica said, you're going to love it here.
