Yeah, which of the two of you would be more likely to keep up the house so it's in salable condition? Courts generally want to let the kids stay put, so it makes more sense for you and them to stay, and for him to find other accommodations.
Yes, too, to keeping all those old tax returns. Make sure they are in a safe place.
Hugs, the sooner you get free of this anchor around your neck, the better. I think a simpler lifestyle will be a great tradeoff for the freedom you get.