The Circle Pacific will set you back CAD6469.00 or USD4725.00 in Business Class - although you may find better deals through consolidators like TourEast etc.
I've just been checking out these fares for an upcoming trip, and although AC/SQ quote the C$6469, for some reason NZ quotes only C$5,500 for Business Class and C$7190 for F. In thinking about it, maybe this is an exchange rate issue, so you may want to go with paying in US$$