First of all, whatever you decide is best for you, you'll simply love holding a bow in your hand this fall instead of camera equipment!
You mention that you're concerned that once you're up in the stand you might have trouble pulling back more than 50#. How about climbing up right now and giving some practice shots from the stand at 50#? It's true that what you're able to comfortably manage on flat ground doesn't always hold true for off the ground, so I'd suggest trying that before buying your own bow.
I'm with the other women on the weight thing - I pull 50# (my bow's max) and plan on moving up to a higher max on my next bow. That being said, 50# gets the kill, and as long as you practice and know how much your arrow will drop at various distances (so you know where to aim), you'll be fine.
Good luck and enjoy!
Laura