[Gooch]

Definitely use Dabs. Don't touch Ebuyer with a barge pole. Dabs might be slightly more expensive, but they are a big company with a fairly good reputation.
Ebuyer on the other hand although are very competitive with their pricing, their customer service/after sales is horrendous! If you have to replace/exchange anything, the only way you can contact them is by email and they can take up to six weeks to get back to you.
I have bought a lot of kit from both of them for my company in the past and would go for Dabs everytime betwen these two.

Some other good online stores are: Scan.co.uk, Aria.co.uk and Overclockers.co.uk