jwb..
I think you are asking the wrong question. Bow length, generally, depends on two things. First, what is your draw length? Bowyers have recommendations as to bow length vs. draw length. So you need a really good draw length measurement!!
Second, is the question of : do you want a longbow or recurve? Longbows MUST be longer for a given draw length. Recurves can be significantly shorter for a given draw length.
Most folks find that shorter bows are harder to shoot than longer ones. Largely due to string angle at the fingers. Depending on what you are looking for, I'd suggest that you can't be far wrong with a longer bow rather than a shorter one.