I'd say that the main thing is that your daughter is growing up in a good environment. If she's happy and being raised well where she is, and you're not getting to spend much time with her anyway, then you shouldn't stick around if you're unhappy.
On the other hand, if you feel like you being close by is somehow making a huge difference to your daughter's quality of life, then you should stay.
Set up a weekly time when you can talk to your daughter over Skype. Make the scheduling for that set in stone and stick with it. If your ex doesn't have the computer, web cam and computer knowledge to set that up, then buy the gear for her and set it up before you leave.
As a side note...WHAT IS WITH ALL MY EXPLORER FRIENDS GOING TO THE WEST COAST!?!? BounceWiggle, uLive, Oryx, Aurelie, Crypton, now you, man, FUCK THIS SHIT!