Welcome. Would you be the Bobbydazzler from Ozbass?
I understand why you are looking locally, even though TBirds are relatively expensive in Australia. The current exchange rate, shipping and import taxes makes sourcing a bass from OS virtually prohibitive, unless you snag an absolute bargain.
Plenty of good advice so far on the models you are already considering.
If you are not averse to second hand, there are TBirds come up in Australia.
There are two black Gibson TB IVs (2005 & 2012) on Ozbass at present
Gibson Thunderbird 2012 -
FS - Gibson Thunderbird Ebony 2005 ($1650) Melb -
Also a white 1980 Greco TB IV
FS/FT: Greco thunderbird bass 1980 -
And my favourite, a 77 Greco TB II
FS:1977 Greco TBII, g&l tribute sb2, stingray 5 ltd NOW WITH PIX -
Guitar Emporium has a rough 1990 Greco TB IV
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I am not connected in any way to any of these basses- although I wish I was!
The Grecos are well worth considering. A few of us have old Greco TB IIs and they are something else- like a P Bass on steroids- more of everything.
Good hunting!