M8, check out the pc spec's post, and then look at www.ebuyer.com

All you need, is a good motherboard + processor combo (i'd go amd personally) a very good graphics card (check www.overclockers.co.uk for their nvidia range)
A lot of ram
Good hard drive space, I'd go for 1 smallish one for windows to run on, and 1 large one for storage.
5.1 at the smallest sound card with speakers

Pioneer 109 dvd burner

Get a cpu cooler desinged for a bigger cou then you have. I have an AMD XP 3200 64+ cpu with a XP 3400 fan on it