Hey, thanks for all the help you guys. This is all really educational stuff!
If anyone's at all interested in what I intend to put together, here's the list.
Mobo: ASUS P7P55D-E $175
CPU: Intel Core i5 760 $238
GPU: Sapphire ATI Radeon HD5770 VaporX $230
Case: CoolerMaster 690 II Advanced $140
RAM: 2x2GB DDR3 $112
PSU: Antec TruePower 750W $130
HHD: 1TB WD Caviar Green Power $75
OD: LG DVD re-writer $30
Moniter: Asus 24" VH242H $225
OS: Windows 7 Home Premium 64-bit $130
Total: $1485
I have actually bought all of the components already, I'm just waiting for some of them to arrive before I throw it together. If there's anything that seems completely out of place, keep in mind I'm a complete newb to this whole "making your own PC" thing.
EDIT: That's $1485 Australian, by the way. Converted to American dollars, that adds up to approx. US$1360.