If you want to fly the glaciers in NZ, head to Te Anau and use the mob that flies from the lake there, I think its southern cross helicopters IIRC. I have done a few heli tours there and the company that flew out of Te Anau was the best.
There was also a mob that flew out of some place on the west coast, south of greymouth that flew up to fox or franz joseph glaciers that seem quite reasonable. They had a green R44 i think.
BTW, the R44 is the best heli for NZ tours, the companies that fly the larger helis will screw you around till they get a full flight, and when you have 6 seats, there is always 2 people that will miss out on a window seat.