This should be a good build for you, its kind of a no frills version of my rig and will serve you nicely I think. Both PC Case Gear and Scorptech are based in Melbourne, so you can pick up the parts locally instead of paying for shipping. PCPartPicker part list / Price breakdown by merchant / Benchmarks
Places where it can be cut down are in the PSU and case. PSU is overkill for the rig as it stands, but will support Crossfire/SLI (and so will the board) later on if you do go that route. Downgrading to a 550/600W would be fine.
Case, personally wouldn't downgrade it. Having a decent case is a good investment.