Ok i made a newegg parts list for you.
http://secure.newegg.com/Shopping/ShoppingCart.aspx?submit=ChangeItem That entire list works out to about 1,790.62 AUD.
Now i added some things you didn't say you had.
OS
CD Drive
Thermal Compound
That adds about 190 AUD to the bill.
CPU: I chose the Q6600, but the processor choice relies on what you do with your computer. If you multitask, alot, and use heavily threaded apps like ido you'd like the quad core better. If all you do is game, the higher clocked dual core will perform a little better then the quad.
Mobo: I chose a solid p45 board by ASUS.
GPU: Brand doesn't matter too much, the only thing that's usually different is the warranty.
RAM: 4gb of performance Mushkin DDR2 6400. If you running a 64bit OS i'd consider 8gb if you have the spare cash.
Case: Now this is mainly personal preference and budget. I like the Antec 1200 alot, it looks cool, to me, and has great cable management. However it's pricy at about 250AUD. Some like the CM HAF more, it's a bit cheaper at about 220AUD. But it's really up to you.
HDD: I chose a generic high capacity drive. WD 640gb. Now it's noting special in terms of speed, but it don't suck either. If you relly want to you can try find a WD Caviar Black Editing. It's about 20-30 bucks more but it's got better read/write speeds. For something even faster you could pick up a WD Velociraptor 150/300gb drive. BUT it costs a lot more, about 290/460AUD.
PSU: Any top tier PSU will do. Corsair, PC Power & Cooling, the more expensive Silverstones, etc. Just be sure you get one that is capable of providing enough power. I chose a 750 Corsair for you.
Cooler: XIGMATEK HDT-S1283 & Support bracket. Nothing better in terms of air cooling atm. Plus i added some AS5 Thermal Compound.
Anyways that's a start, you can fiddle things around until you have it about 1600AUD.
My suggestions; Don't skimp on the PSU, personally i wouldn't go less then say 600w for one card, and no less then 700w for two. Preferably 750w. Easiest place to save a few bucks is probably the case. Everything else i would just try to find sales/combo deals etc.