Look at the research (search google) - it brings up gems like this:
"Relocation by a parent may have serious, long-lasting consequences for children, as well as for the non-moving parent (Kelly and Lamb 2003; Ricci 1997). Braver, Fabricus and Ellman (2003), for instance, recently surveyed over 600 North American college students whose parents had divorced. They found that young people who had experienced relocation by either of their parents reported faring worse on a range of financial and emotional outcomes compared with those whose parents had remained in close proximity to the other parent. The cross-sectional nature of their data, however, did not allow any specific causal relationships or processes to be unpacked.
But relocation can also have benefits. According to Kelly and Lamb (2003), where a resident parent is competent, and relocation improves his or her educational, career or repartnering opportunities, then children are likely to gain from that parent's enhanced wellbeing - especially if the children can maintain a meaningful relationship with their non-resident parent through regular contact. Where children have a distant or disturbed relationship with a non-resident parent, or where children are caught in the middle of high levels of parental conflict, relocation is also likely to enhance children's wellbeing (Wallerstein and Tanke 1996). More commonly, however, where children have a meaningful relationship with both parents, the relative costs and benefits of relocation are far more difficult to weigh-up (Kelly and Lamb 2003: 202)."
Comes from this website:
www.aifs.gov.au/institute/pubs/resreport9/5.html
This is also a mine of information:
www.thecustodyminefield.com/11.html
IME you may well find that as DD gets older she wants less and less to travel 3 hours/6 hours every weekend, and wants to stay near her friends, oncluding at holidays. You may well find that your decision to move results in her having at best a fragmented relationship with her father, and at worse no meaningful relationship. All because your partner won't move to be near you? Why won't he move? What if your relationship with him breaks down? Stastistically there's a real possibility of it.