honestly i would get either a mugen mtx4 or a kyosho rrr as these cars are supported the best at moorebank raceway (where i believe you race).
no one runs g4s or serpents and we only get one nt1.
the more people that run the same car as you means that if you break something and you don't have spares, you can always borrow one (or even buy one) from someone else.
i run a kyosho rrr and am very happy with it.