So a "Do-It-You-Self" system that is connected to your mains water supply may not be the best option? - Think about it, you would save a bundle when heating hot water.

Would anyone recommend a Fan/Liquid cooling hybrid or is that a bit of a overkill?

"Do-It-You-Self" system

someone will try

As to your cooling Rogem what will you be using your Computer for ? Gaming, Home Office, all round use ?

Well, right now I'm on a HP Pavilion which only allows fan cooling. But I was looking into liquid cooling for a server farm and possibly a new desktop.

Wont be cheap Rogem but keep in mind servers stand alone or rack are mostly air cooled, but if you want to build it why not >

A rack-mount server system of a liquid cooling system, in which a heat-generating component such as a CPU is cooled by a coolant has a plurality of server modules with heat-generating components which are cooled by the circulating coolant. The server modules are connected in parallel to a circulation coolant path through which the coolant to cool the server modules is circulated. In the middle of the coolant circulation path is a cooling unit that cools the coolant by radiating its heat to the outside air. Furthermore, a bypass route parallel to the server modules and going around the server modules is provided in the coolant circulation path, and the circulation quantity of the coolant is controlled in the bypass route. Alternatively, the flow quantity of the coolant is controlled in each of the server modules.

I have a feeling my "Do-It-Your-Self" system idea needs a proof of concept...
*Gets out hammer..."Now where is that pipe?"*

very few systems need water cooling (ultra gamers or power rigs) my latest build is air cooled and my temps are low, spec >

Spec - Home build - gamer / multi use

Case - Thermaltake Tsunami VA3000BWA BLK WINDOW
PSU - Enermax Galaxy 850W EGX850EWL ATX2.2 Modular PSU
Motherboard - Asus P5N-T Deluxe nForce 780i (Socket 775) PCI-Express DDR2 Motherboard
CPU - Intel Core 2 Quad Q9300 LGA775 "Yorkfield"
Ram - OCZ 4GB (2x2GB) PC2-8000C5 1000MHz ReaperX HPC Enhanced Bandwidth Edition Dual Channel DDR2
Graphics Card - ATI Radeon HD 3870 X2 1024MB GDDR3 TV-Out/Dual DVI/HDMI
Sound Card - Razer Barracuda AC-1 Gaming 7.1 Sound Card
HDDs - Western Digital Raptors X 150GB 10000RPM SATA 16MB Cache, X3
DVD Drives - LG Black SATA GSAH30NBAL 18x Dual Layer DVD±RW DVD RAM Writer, X2
Keyboard - Logitech G15 Rev.2 Gaming-Grade Illuminated Keyboard
Mouse - Razer Death Adder
Monitor - Samsung SM-245B 24" Widescreen LCD TFT Monitor - Black
Exturnal HDD - Western Digital MyBook Essential 500GB USB2.0 External Hard Drive
OS - Windows XP Ultimate SP3
Router - Linksys WRT54G - PFd

Oh that sound sexy :P *Mike drools over specs*

I was thinking of investing in a new external HDD, is western digital quite good?

I could only really vouch for HDDs i have used myself and these include W/D, Seagate, Samsung, Maxtor, but if you go W/D or Seagate you wont go far wrong

*its very sexy*

Right now I have an ageing Samsung 80GB. It's quite portable, but I'm mainly looking for a overkill external. *Just encase you wanted to know*
I saw a quite cheap one on Amazon (500GB for like £77 - Freecom Hard Drive 500GB External USB-2, silver) made by freecom, the last freecom product I brought had an epic fail has anyone tried this type?

No not used Freecom but i would stick with a make you know