OK guys, the word is we're fairly short. ACC/TMA and ADC all considered and radar controllers from overseas are eligible (via a local/expat formula which is a bit long winded for me to post definitively on) are probably elegible to ge directly to a centre. In actual fact the centre is in Christchurch, all the radar sectors except oceanic are run from there. If you don't want to go to Invercargill, or any other extremity type place, just tell them sometime during the application process that you probably wouldn't accept a job if that was the offer. Here's the link.
http://www.airways.co.nz/careers/vac...acancy0630.asp
Hope this helps.
BTW union membership is encouraged. NZATCA is a member of ALPA.