Every year and a half or so I do a complete upgrade of my system. This upgrade happened to fall right before SHIV's release.
Here's the system I am building (mostly for SHIV):
Core 2 Duo E6600
Intel Bad Axe 2 mobo
2GB Corsair Ballistix PC8000
Evga 8800GTX
Silverstone 1KW PSU
Sound Blaster Fatal1ty X-FI XtremeGamer
CPU is watercooled with an Apogee GT waterblock. Rad is a Swiftech MCR-220QP. Res is an EK-200. Pump is a Laing DDC-2 (18W) with Petra Top. Tubing is going to be either 7/16ID x 11/16OD Tygon or 1/2ID x 3/4OD Tygon. I decided not to watercool the NB and Videocard for right now (I don't like to OC my videocards). The NB has a fairly large heatsink on it by default, so I'm going to see how that works out for now. If the NB ends up needing some extra cooling, I have a DangerDen Maze 4 waterblock on standby just in case. Fluid is distilled water + Pentosin G11 + a few drops of PT Nuke.
I figure, what good is a computer designed for a submarine simulation in the Pacific, if it doesn't have blue water running through it. So that is what I am doing. lol