You will love New Zealand, and September is a quieter time to visit and get around the country than the high season summer months.

Having recently returned from my second trip there, I would strongly recommend Otahuna Lodge outside of Christchurch on the South Island. It is an incredible former homestead--the largest in the country--with an exceptional staff. Jimmy McIntyre, the head chef, provided consistently the best meals on our trip in New Zealand.

Furthermore, it has been recently purchased by two American-expats. They have shut the Lodge for four months to carry out a series of sweeping renovations. From what I understand it will set a new standard of lodging in New Zealand once they are finished. The GM of another property on the South Island even told me about Otahuna, "they are going to be the Lodge to beat in the country, once they are up and running again..." The website says that the Lodge will be open again in May, so it should be going at full speed by the time you are there in September.

One other place not mentioned in these posts--and worth considering--is the Lodge at Paratiho outside of Nelson. It is in a stunning region with many beaches and great food and wine pursuits. The rooms are first-rate, and the kitchen is fantastic. Plus, it gives you access to an area that is somewhat off-the-beaten track for many overseas travelers to New Zealand.

Hope this helps.