Another welcome from Australia, Ryan. That big back tyre is the cause of much discussion and debate on here. We chew through them pretty fast and, apart from the standard Metzler, there's only 2 other brands of bike tyre to choose from - Avon and Bridgestone (which has a higher profile). And they're not cheap. Some have gone for car tyres - "darksiders' we call them (or they call themselves). It's not for me but plenty swear by them. You'll be able to research your first tyre selection on here and also get PLENTY of advice.
My tip: go with the Bridgestone Exedra Max.