RE: Draw weight
Holy smokes. I'll try my best to answer all of the mentioned questions.
1. I am drawing 70lbs, I can't speak for anyone else.
2. Most common between 50-60 and 60-70? I don't know, you might want to start a pole to find out.
3. Will your draw weight shoot up after you get a new bow? Sometimes. If you are young and have a lot of growing still to do, often you will go to a higher poundage. If you are older, often you won't go to a higher poundage.
4. A 50-60lb bow maxed out at 60lbs will shoot better than a 60-70lb bow at 60lbs. I purchased a 50-60lb set of limbs last year. This year I sold them for 60-70lb limbs. If you go with the higher limbs, just start doing pushups and in a very short period of time, you will be comfortably shooting at a higher weight.
Best of luck.