Yes. You should get a car if you plan to live in Brisbane. If you work in the CBD, the public transport is not so great if you live away from the train lines. Trains are efficient tho. I never trust buses - they're too reliant of traffic and the traffic in Brisbane is unpredictable at any time of day. Brisbane covers alot of ground so a car is a must if you want to make the most of your time here.
In terms of cost, it really depends on what you want to spend. Just make sure you get a car with aircon. Petrol here is only a little bit cheaper than interstate. No savings there!
I hope this helps!
