well welcome to the hardware novice club mate^^
k, 1000AUD is pretty good
firstly for the motherboard id suggest u get the
Asus A8n32-SLI Deluxe
For the prosessor dont get the 64 3200+ on a 939.
There is little price difference between the AMD 64 3200+ and the AMD 64 3500+. Id go with the 3500+, or if u can afford it, then deffinetley go for the AMD 3700+ San Diego.
But if u cant try stick with the 3500+
If u want to go for a cheap but ok Hard drive id go for the Hitachi Deskstar 7k80 - 80GB Sata II.
For the graphics card id deffinetley get a eVGA e-GeForce 6800GS 256mb.
For the power supply id get a Antec Truepower 2.0 430watts.
For the cas a CoolerMaster Centurion 531 Silver... itd be pretty awesome^^
For ram, Kingston ValueRAM 1GB 400MHz t comes in 2X512 which is fine, unless u wanna take one bar with 1 gb... since Windows Vista can take use of it fully.
But with this setting ur Windows Vista ready def