everyone will recommend their own tyre places, but go and speak to Troy at Jack Baker Tyrepower on Currie St (website: http://www.adelaidetyrepower.com ) and he'll be able to go thru what he's put on similar cars, what works, what doesnt, what size is good, and what is good on your back pocket
i can guarantee there's plenty of other places people will point you towards, but at the end of the day, shop around and find yourself the best deal for what you like the best