I am also looking for PhD opportunities to complete my Education Ladder , so I hope to offer you some suggestions :
Some of the top rated universities are Uni of Sydney , Monash , Uni of Western Australia .
NOTE: PhD in New Zealand is Local domestic fee rate , ie NZD 5600/-to 7000/- only . ( AMAZING FEE STRUCTURE OFFERED BY NZ ONLY FOR ALL PhD STUDENTS- DOMESTIC OR INTL)
But the main factors to consider before starting any study course are:
1. Field of study( Engineering , Science , Arts , Medicine etc)- Bachelors, Post Grad, Doctorate , Post Grad Diploma , Trade certificate etc
2. Fees and Scholarships or grants
3. Location and region
4. University Ranking and Rating ( If you really care)
5. Campus Recruitment and local job market
6. Career oriented courses at particular universities
Hope this helps
Cheers
Mushahid M