I am using Hubitat. They support wide variety of countries frequencies and provide both Z-wave and zigbee USB dongles to plug into the controller along witht the right plug for NZ. All up incl USPS shipping it was under $250 delivered.

 

The thing that attracted me the most was that it is cloud independent and works 100% offline and the dev community and the dev community is very active and the founders did fair bit of work on SmartThings.