I agree that right now cryptoboreas is the best option pricewise right now. I'm pretty sure GND hasn't finished their datacenter expansion yet, which means their rates are still going to be quite a bit higher than CB.
On the other hand, great north data has a 24/7 onsite tech, something cryptoboreas doesn't have. If there's a problem, its likely that we will get our miners back up and running faster if we go with GND.
It really depends if you guys think its worth it or not.