Thrashduck's top tip - Buy a monitor with an ibuilt TV tuner for around about 120 quid.

IT'S WIN WIN!

Most 17" monitors run at 1280x1024 and they're pretty cheap now, £90 max for a decent one.

The nVidia 8800GTS should be able to handle most games with pretty high amounts of detail. I wouldn't charge for building it, so you don't need to worry about that. I'll run up a proper spec for you in the next hour or two, working on £600 maximum. As for a TV tuner, you can get a TV card for about £30 - I'll put it in if the spec leaves enough room.

Oh sweet bro, well - if theres no shipping involved (i'll pick it up), make it a 750 max.

And I will definetly owe you a drink or 12!

Sorry it's taken a couple of days, prices may change slightly between now and when you order. The overall gist of the spec is:

CPU - Intel Core2Quad Q6600 (2.4GHz - 1066Mhz FSB)
RAM - 2Gb PC2-8500 (1066MHz clock speed)
Motherboard - Asus (integrated WiFi)
Hard drive - 750GB Samsung Spinpoint F1 (SATA-II)
Case - Akasa Zen (Black)
Graphics - XpertVision nVidia 9600GT 512MB
Monitor - HannsG 19" widescreen (1440x900 resolution)
Operating System - Windows XP Professional SP3