How long have you been seeing each other?
I'm sorry, but I wouldn't uproot my children from their schools for anyone.
I might make the decision to do so if I felt they were going to benefit as much as me, but I'm not sure that a 'blended' family really is ever in the children's best interests. I think that it's a decision adults make because it's what they want to do. Some adults realise it's not going to be easy for the children and do a good job of managing the transition, others expect the children just to fall in because it's what they (the adults) want.
I know I'm not alone in this, but the thought of moving in with someone else, accommodating them and their children, compromising where there are differences, conflicts where compromises can't be reached...
Well, I can't think of anything worse! Give me seeing someone twice a week over that any day! In fact, I think even seeing someone twice a week would feel like too much when I consider the children and all the other things I have going on...
Not directing this at you personally, OP, but I do wonder why some people are so keen to do this.