I live northwest of you. By 8 hours. So it gets super cold up here. Going with the foam is more expensive, but in the hear savings it pays for itself in 5 years. So, if you're going to live there for more than 5 years, get the foam. If you're planning to live there less than that, get the blown.

In both cases, go with the ceiling insulation, not the rafters. The rafters won't give you enough thickness, and you'll need an air chute the entire length of the rafter, to prevent ice dams. You might have venting issues because of the way roofs were constructed back then with the center spine acting as a venting block.

Fellas, this is half inch rock. The tape hook isn't static, and moves a little. Push it in like this and it measures too long. In this case, by less than a 16th. The 5/8ths line is very far away. If you'd measure it by hooking on the back, it would measure a perfect half.

Here's a major clue. DON'T USE ANY QUICKSET MUD! It's a gigantic pain in the ass and should only be used by pros on a small job. Taping is more of an art than trade, as you need to feather and sculpt the wet mud to make the wall appear flat.

Self leveling concrete. No cheap but you'll never have to mess around with it ever again.