Manufacturers

Hardware.....

Cases and PSU

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Not only does a little research get you a good looking case, but it can get you a case with a well thought out design which can help with many other performance aspects of your system.
The appearance of your computer case will really be a personal decision that you need to make.
XCase
Antec
Corsair

Motherboards

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Now that the i7 series of processors have come down in price, gamers everywhere are looking to find the perfect motherboard CPU combo to improve their gaming performance.
Having the best processor for gaming is crucial for performance.
EVGA
ASUS
ASRock
Gigabyte

Graphic Cards

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ATI vs nVidia: It's the age-old fight amongst us PC gamers and enthusiasts that never seems to end. As the two video card giants continue to produce and innovate amazing cards in their respective Radeon and GEforce product families, the battle continues to rage on. Check them out for yourselves, they are both good!.
ATI or nVidia

Monitors

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The main difference between a normal monitor and a gaming monitor is the response time. Displaying changes in the game, on the screen more quickly improves the experience, for a smooth continual picture whilst gaming. The monitor response time needs to be 2 ms.
LG Monitors
IIyama
Samsung
NEC UK
ViewSonic

Sidewinder Devices

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The Microsoft Sidewinder series gaming mice and keyboards are top gaming products that are excellent additions to any gamer's computer system. The performance of the X8 mouse coupled with the features of the X6 gaming keyboard make a fantastic match for the gaming enthusiast.
Microsoft Hardware

Other Hardware
Logitech

Printers

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In the real world, a printer outputting at a mere 600 dpi may well produce better prints than one outputting 2,400 dpi. The reason is that there are many other elements at work, such as hardware and how accurately the  software that controls the printer, known as a 'driver', can manage the printer.
Canon UK
Hewlett Packard
Epson UK
Lexmark UK

If your computer says, "Printer out of Paper," this problem cannot be resolved by continuously clicking the "OK" button.