May I remind you of something called "HALVING" before going crazy on a purchasing spree?
July 2016 is 10 months or 300 days away. Making this the perfect time to expand. Since you should roi in 250 days with this gear.
Where did you get that number? We are definitely going to have a lot of difficulty increase as more and more of these are made and batches hit the scene so the idea of no difficulty increase (268 days) is not a good thing to buy based off. A 2% difficulty increase increment gives us 404 days without taking the halving into effect, which means it would be definitely longer.