You know our sittuation and we will have similar issues except that we don't have any choice, DS1 will start at one school and then will have to move to another school probably in another state. However, he is a fairly easy going kid who copes really well with change.

Will your DD1 be comfortable having to change schools? If you think she'd cope then I'd put her in School B and move her to School A. If you don't think she will cope then I'd be inclined to put her in School A and travel back and forth for the year. 1 year of extra travelling is better than 6 years of extra travelling. And then what happens when DD2 starts school? Do you send her to School B as well???