Whilst we do have a grey warbler here who visits daily (I assume he/she is nesting), for me it's the saddleback this year.
I have an excellent action shot I took of a kea up at treble cone, but they are an easy target for photographers, as they like to stay relatively stationary for long periods whilst destroying things. Bellbirds are trickier, and kaka very easy, especially the kaka on Stewart Island who like to be handfed bananas and crackers.