150 or 50 or 500 you are still going to have the majority of your bucks leave the property throughout the year and go where someone else could get after them. As far as just making appealing habitat that will tend to hold more deer, 50 is enough if done properly, but 150 is better because you have more room for various appealing things to deer. The big 3 as far as I am concerned are security, food, and water. Honestly, it has been my experience that security is #1 by far. They can travel at night for food and be back before light. If they feel safe, then they stick around.