Just came back to Christchurch - I did the RON Pass (South Island + South Circuit) with Stray and it was just awesome.
Cool drivers, good information, save travel, met lots of pretty cool people, doesn't matter if ur traveling alone, or in a group, you will have good fun!
Most people can't decide between Magic, KIWI, Contici and Stray...
Let's say it so:
1) KIWI: Party + seeing the country
2) Magic: Seeing the Country while sleeping (?!)
3) Contici: Party + "who cares about the country? I'm too drunk!"
4)Stray: Seeing the Country + Party
This shud make it easier for you to decide - i can just recommend it! Sweet as :-)
cya
simon