Seeing a lot of this here, and Tim Cook even brought it up as a reason the X is so expensive and that people should just focus on the monthly price instead of the total. It's the standard car salesman trick: "Focus on the monthly payments and it's only a few bucks more, see! No big deal!"
People here are saying to just buy the 256GB because it's not that much more. Wrong! The price of the 256GB is 15% more than the 64GB. That's a very large percentage difference for something that might not make any difference to you. Apple Care+ is another %20 of the cost. In total if you go for both of these then you're paying 35% more for the phone. That's huge!
Always look at the total cost of something to make the decision if it's worth it for you. That money will be out of your pocket either way, so don't fool yourself by thinking it's only a small difference in monthly payments. Decide if the value is worth it for you BASED ON THE TOTAL PRICE, not the monthly payment!