Your in Melbourne so you have every option at your disposal. You have already mentioned APR and Bluefin, so here are a few others:
GIAC (see Tim at DubAddiction) Dub Ad·dic·tion [duhb uh-dik-shuhn]
Revo (see AudVolks) Revo Technik - Australia
DNA Tuning (speak to John at DNA) MK V/VI Golf GTI + SRS-II Special although i dont think the SRS hand controller will work on your Jetta. I believe it will need to be bench tuned (removal of ECU).
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