A lot is going to depend on how sensitive to stacking and finger pinch you are and how much it is going to effect your accuracy.
Personally, I draw just over 31". To be honest, there was only a few bows that I can recall that felt smooth to me through entire draw. One was a 68" Original Brackenbury Drifter Recurve. Another, a 70" target recurve with WW Inno or Winex limbs. Lastly, I had two HH style longbows that were 70". All I can suggest is to try as many bows as you can and try to decide for yourself. Or maybe get draw curves from potential bowyers.
Don't get me worng, I can still shoot bows that are shorter then that, but for complete stack and pinch free those were the ones that I have shot anyway.