IFT in Christchurch are very good, they are an off shoot of the Canturbury Aero Club and have always been very busy every time I have been through Christchurch. Lots of international students at one of NZ's main international airports, so very good experience.
The NZ licence is generally well regarded every else in the world, although you are required to convert it if you want to fly professionally in the UK/Europe or the US. Flying jobs in NZ itself are rare as hens teeth so don't rely on that route. Beautiful place to train and the chance to experience things not generally done in the UK e.g. Low Flying below 500'.