If you didn't like living with them before, it probably won't be any better now. That they seem to be on your side currently could always be extremely helpful in the future, and having family from HIS side that care about them is important to your children, and them not having more LOSS from his choices. But living together always strains relationships, better save their goodwill until you need it. However, living NEAR them, not with them, might be a good long term goal, but just take it one decision at a time, one day at a time. Sounds like you have a big day tomorrow. I'd try not to change anything for those kids that you don't have to, This would not be a good time to sell any property. Moving far away from him would only ensure that the children don't see him very often and there can be laws about moving your children away from where your ex lives, you need all the information before making decisions.
At least all your SS friends will be as close as your computer, whereever you go.