It is a bit of a long flight, but definitely Cape Town South Africa.
The currency is super weak, so your accommodation and living expenses will be a breeze. You can also buy gear for cheap and claim your 14% VAT back before you leave.
You've got hot African sun and wind so good that the Red Bull King of the Air competition is returning for Jan 2014 http://capetown-watersports.com/red-bull-king-air-2014/
Basically fly out to Cape Town and it will definitely become your top kiting destination guaranteed.
For all other info check this out http://capetown-watersports.com/