It's possible to get a good PC for that price, here in the states that is. AU I don't know since AU charges alot more on everything. lol I don't even think y'all have a dollar menu yet you say you get paid "$17 an hour" for minimum wage. ANYWAYS
I would consider just picking up some used parts on eBay, NewEgg is pure sh*t, they overcharge everything and everyone just bites the dust so they can say "I bought it on NewEgg". lol like anyone cares...
My first gaming laptop I bought on Craigslist for $100, yes...$100 for an i7 3.4GHz, 4GB, Nvidia GT505, 500Gb laptop. Guy tried ripping me off by selling me a laptop with Windows 8 "trail". He didn't know how to get it back to Windows 7 after realizing that Windows 8 wasn't free.
Best laptop I had, sold it for $400 and bought a watercooled desktop on Craigslist yet again from some kid that was going to college and didn't want to take it with him. Sold that 5months later for a Surface Pro + Keyboard and $100. Played with Surface pro, showed off to everyone at school that I own such a costly new device (back when it was new and costed a ton). lol then sold it for $500 and started building my own PC part by part.
Ended up spending $650 for everything I have now.
So yea I would consider bumping up your price margin since you're in sh*tty AU. Cause you're not going to get anything cheap out of that country.
Lastly, if you plan on ever getting Windows 8 for gaming...enjoy your lag and "Not supported". Anyone that says Win8 is good for gaming only plays Minecraft while fapping to midget porn all day.