So after months of waiting, it's finally ordered. Just thought you guys might be interested in what I got, and the prices because there are some great deals on at the moment, especially in the Scan 'Today Only' section (which will be available until the end of the year).
All these are available at the moment, and include VAT.
Intel Core 2 Duo E6400 Retail - £138.64 - Scan
Asus P5B - £90 - Couple of months ago from ebay
GECUBE X1950Pro 512MB - £139.94 - Ebuyer
Western Digital WD3200KS 320GB - £51.09 - Ebuyer
2GB (2x1GB) CorsairTwinX XMS2 6400 - £170.38 - Scan
AKASA Zen case - £24.66 - Scan
550W Xclio PSU - £49.94 - Scan
Arctic Cooling Freezer 7 Pro CPU Cooler - £14.68 - Scan
Samsung SH-S182M/BEBN Black Lightscribe DVDRW - £19.39 - Scan
HannsG HN198D 19" TFT - £121.01 - Ebuyer
Logitech Cordless Desktop EX 110 - £16.63 - Ebuyer
Creative Sound Blaster X-Fi Xtreme Music - £51.45 - Scan
I've had to scrimp in some areas like the case and the graphics to keep it on budget, but all this (plus WinXP and a couple of little extras) came in at around £960 delivered, so not too bad I think. It'll certainly do me for 18 months or so, considering I'm not an avid gamer, and I can always slip in a DX10 card in 6-9 months time.
Any comments or suggestions are welcome, and thanks to everyone for the advice over the last few months.
EDIT: Got so excited there I mis-spelt the title. Feck.