I suggest that you go to Centre Com for your parts. They have much better prices for components, although they may have a lesser range of power supplies.
Unfortunately PCCG does not price match in my experience, although if you threaten to go to another retailer for your PC you may get lucky, as the market is quite competitive in Aus! ^.^
Centre Com will price match any product they have in stock to other retailers, just be sure to check with their live chat which is available something like 10am-6pm weekdays.
Worst case you can get everything apart from the power supply from Centre Com, and just order that separate from PCCG with shipping.
Just thought i'd let you know on how you could potentially save a bit of money.
Good luck!