I built my first last year, then after a few friends saw it I've built PCs for them too.
Antec 300 case with a few more fans in there, and a 5/12V switch panel for them. All of the fans currently have resistors, so they don't actually get that much power.
AMD AM3 Phenom II x4 955 @ 3.2 GHz
4GB DDR3 1333 RAM, will put another 4GB in when the need arises
Gigabyte GTX460 factory overclocked
1TB HDD, nothing special
LG disc drive, the Lite-On drive I had failed a couple of months ago.
550W Antec TruePower PSU
24" LG monitor
Creative T3130 2.1 speakers I bought in Thailand
Logitech MX-518 mouse, absolutely love this thing
Logitech K200 keyboard from Hong Kong, complete with Chinese characters
I plan to one day get more RAM, a SSD, cut a window in it (once I find suitable rubber to cover up the hacked metal), then install blue LEDs.