171 is the Windriver Indian Reservation. You'll need either to pay a guide to hunt there or be a member of their tribe or a reciprocating tribe. 160 is a good unit for deer and is the region E tag, which is good, but with four points, I'd consider these units for you and your son:120, or the area of 78, 79 and 80. Region E is a great tag, don't get me wrong, but you may enjoy a limited entry hunt more for deer with your points. Is this for a 2015 or 2016 hunt? If 2016, you'll have more opportunites becoming available with 5 points, especially for deer. You're in the area now where some great hunts become available with 4 and 5 points. If you're willing to pay the special tag prices, you'll get into a lot more options of great deer areas.