Im from New Zealand as well.
Just what size feild do you fly in ? a football size feild or smaller ?
In the past have gone months waiting for days suitable to fly in NZ. You need to be realistic about flyable wind levels, especially as a beginner.
Its been quite windy lately, not a steady wind but gusty, often too windy for a nice normal flight.
The other thing is as you go higher, the wind gets worse.
If you want to fly UM's you need a windless day. UM's are not for windy days that you will be seeing in Welly.
Try and fly somewhere thats sheltered from the wind.
Get a plane that will cope with wind, some are better than others. But you need a bit of room to fly.
I know that in NZ many planes (and parts) are simply rip-off pricing, with a few exceptions , but most stuff is available on trademe or online NZ shops. I almost allways buy from overseas, Hobbyking has a great range of good and bad planes. Just do a bit of research before buying.
Realistically, for wind would recommend, an AXN (a bit hard to launch), a Bixler1, a HKing Teksumo(needs a programable radio) .
Also , try the NZ Parkflyers forum. Someone local to you may be able to help out a bit.
http://www.parkflyers.org.nz/modules/newbb/