Well, I've had 1 contractor come out to give an estimate for spray foam. For closed cell, it's something like R6.3-6.5 per inch. I calculated around 900 SF of wall space. I asked for 2", and he practically gasped at that, being $3.75 PSF. He said that 1" was more practical (6.x R value, and then R13-R15 fiberglass in the wall cavity).
My walls have been absolutely dry with no sign of moisture since we moved in (poured, with outside drainage board, and a asphalt type sealant) , so I'm not concerned about water. So, I'm waiting to get the actual estimate later today. I'm probably going to get 2 more before I decide anything.
I think I'm going to price out some XPS in the meantime. I'm OK with spending a couple grand to insulate it properly, but the first estimator didn't really do anything to "sell" me on spray foam. I was kinda hoping for some kind of sales spiel.
I was trying to get some feel for the value of spray foam, and he said that he sees lots of block foundations that have cracks, moisture, etc.
I feel like a nutjob getting insulation quotes on a new build...