I would avoid overclockers.co.uk I used to use them becuase they had good deals with the weekly deals but their after sales service is aweful.
They wont collect faulty goods themself, you need to organise to get things returned and then keep at them to get the money refunded for the postage.
They argue about if things are faulty or or not and cleary dont check items on a return and just send them back to you saying they are fine.
Their customer service can take hours to get through to talk to somebody and a few times they just hung up before I could say anything (to empty to call cue)
I would use ebuyer have found there aftersales service to be much better.