Thought I would start a link list of Sites that are recommended for buying hardware. (or software if you wish)
Feel free to add a link but I think it's better to only add a link if you have used the company and it's worth recommending:
www.redstore.com www.dabs.com www.jungle.com www.ebuyer.com (my favorite)
www.overclockers.co.uk
Used them all apart from redstore which was recommended by Rolfw
nobbly