Doesn't matter what car it is, expect to pay ~$3k per year maintaining the vehicle (rego + insurance + services). Keep in mind that servicing is more than just servicing the engine, you need to keep an eye out for tyres, breaks, transmission, lights, steering & breaking fluids. Generally, these things get replaced around the 5-7 year mark. If you buy a car less than 5 years old, be prepared to shell out when these things need replacing. If you buy a car more than 5 years old, be prepared to shell out if the previous owner was lazy.
I recommend Holden simply because they are easier to service. Internal parts are more accessible due to the fact that it's a bigger car and there's more room under the bonnet. If something goes wrong, the mechanic is not going to charge you $400 to disassemble and reassemble the front of the car.