Thats true Carole. NZ butter would be close to the best in the world, as are all of ther dairy products.
I never use margarine. All my recipies are used with butter. Try doing a sauce with margarine, compared to one with butter, it will taste like it's been strained through someones socks. Now there are probably better margarines out there, my advice if you are sticking to margarine is to read the label, find out whats in it, and if you still feel like eating it then go right ahead. It boils down to having everything in moderation, and having a balanced diet.