Specs of my gaming machine:
CPU: Intel E4400 @ 3.00ghz
RAM: no-name 2x 1gb @ 675mhz (a small overclock :D)
Video Card: ATI HD3870 512MB (stock at the moment, going to overclock it soon + go crossfire)
MoBo: Asus P5N-E SLI (yeah i know, crossfire won't work :D, going to replace it with an X38 or X48 when the time is right.)
Hard disks: 2x Samsung Spinpoint T166 160gb in RAID0
1x Samsung Spinpoint T166 320
Soundcard: X-Fi Xtreme Music
DVD burner: some sort of dual layer burner from (also..) samsung.
Power supply: Be Quiet! 450 watt.
All this is packed in a modified case, with 3 system fans. (front, back, and side)