Back to Australia
I moved back to Melbourne, Australia, in early 2011.
I still visit family and friends in NZ, but the majority of my extended family are in Aus, and it's where I had most of my childhood.
Ultimately, my girlfriend was the immediate deciding factor - we'd just done 3 years long distance, and I wasn't about to pass up the chance to live closer to her.
I didn't have much of an income to speak of at the time, and was about to start university. The prospect of "moving out" was daunting. I was able to get cheap board with my grandparents though, which made the decision much easier.