I believe it is a re-branded Fenghua airbrush (Chinese OEM), not Sparmax.
Good point about the spares. I have since contacted a supplier in NZ regarding Sparmax and I can get a Sparmax MAX-2 & TC-501/g/ compressor + airbrush set which, although being $100 over my budget, has a local supplier so support will at least be possible and from what i've read, Sparmax is reasonable quality for the price.
Thanks for the help, although not directly answering my original question it has raised a few more important things I didn't consider and helped me towards choosing a more sensible setup!