Well, if I buy my own PC, what do I need? I'll list what I know...
Motherboard
Graphics Card
CPU and fan
Hard drive
RAM
Optical drive
PSU
Case
Do I need a sound card? Or will onboard sound be good enough for games? Should I just get a cheap one?
Someone suggests I get at least a 700 watt PSU. Any recommendations for a quiet PSU at that watt usage that is affordable?
Also, does anyone have a recommendation for a cheap but good quality case? Something that looks good, too. Some cases look atrocious.

What do I go for? ATX form factor?