Here's a rig from the office.

Specs:
Core 2 Duo E6600 (Socket 775, 2.4GHz, 4MB L2 cache)
ASUS P5LD2 SE board (i945P)
2 GB DDR2 RAM
Palit Radeon X800GTO with 256MB RAM
Realtek 8169 ethernet card
1 250GB SATA hard disk
1 DVD-ROM drive
1 DVD-RW drive
400W power supply

Power consumption ranges 90 - 96 Watts idle under WinXP, 150 - 165 Watts when loaded or busy (playing games, DVD burning, compiling).

CRT Monitors power consumption ranges from 70 - 110 Watts. While LCD Monitors 40 - 50 Watts.


Hope this helps.