Well, I don't know if you can compare my prices to your Australian, but if it helps, here's what I spent:
PC Chips M599-LMR Motherboard + AMD 500Mhz CPU: $139.99 (+$10 shipping)
(Built in Sound, Video, LAN)
64Meg SDRAM - $47
30Gig IBM HD: $160
ATX Power Supply (The smallest I could find): $39 + $10 ship
Inverter: $29.99
Numeric Keypad: $15.99
CDROM: $40
LCD (BG Micro Serial 20x4 kit): $40
Total: $531.97
I still need to build my case too and figure out how to get the sound to my radio, which may require a new head unit.
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