I've been chatting with one of my techy friends while browsing an online shop (ebuyer). This isn't necessarily where I'd buy the stuffs from, and this isn't necessarily the final stuffs that I'm getting, but for a general idea of what I'm looking at (looks like I'm going for a ground up job)...
Monitor
DVD drive, to compliment my current one.
HDD
Case
Fan
Video card
RAM - I'll probably go for two of these.
Processor
Which, to my knowledge, leaves me in need of a Motherboard that could handle all of that and leave room to expand on the RAM. Price so far of £820 ish.