1001.38 miles. Would have moved further if need be.
I moved because it's worth the risk. I'm also still young (kinda) so this is really the best opportunity for me to undertake this type of venture. Short of Christ, this may turn out to be the best thing that could happen to me so, yeah... I'm going to do it, but, if it doesn't work, hey... at least I gave it a shot and found out first hand it wasn't ment to be rather than living the remainder of my life wondering, "what if..."
If the person is worth it, and in my case she is very much worth it, and if you want to see how things may end up, then, eventually someone is going to have to move. Sure there is no guarantee that it will be successful (read marriage) but, I feel more confident things can work out if we are together rather than far apart. Being close adds a whole new dimension to the relationship that you just can't make up for online or on the phone. You can't replace touch nor can you replace those special moments that only happens when you are near. Beyond that, if you romantically love a person, I don't know how you wouldn't want to be close to them.
As for you having kids I guess that really makes things difficult. I personally would have to do what's best for my children, but, if they were comfortable with the idea of moving, I'd find a way to make it work... I'm sure you can find a new job (even if it pay's less) and you can also work things out with your ex. I'm sure she's your ex for a reason... (Oh, and please note that I am not endorsing remarriage if it would be seen as adultry)
Anyway, thats my two cents.