You should be fine with the factory tune, I'd hold off until you get those extra couple of mods.
Seeing as you're in Canberra, have a chat to Ultimate Tunes in Phillip. They're good guys and they've tuned a few MPS (3 and 6) succesfully, one of the guys actually has a 6 also, and might have some other tuning options for you other than the chiptorque (they are ECUTek dealers, but can tune just about anything).
They're also one of the few places here that have an AWD Dyno. Doesn't effect you with the 3, but good news for those of us with a 6![]()