Best External Hard Drive for £150?

[fonz]

Hey all,
A friend of mine is a wedding photographer and he has been thinking bout buying an external hard drive to back all of his wedding photos.
He has £150 to spend and is basically looking for the best model he can get for his budget.
Does anyone have any ideas?
Cheers

 

[fonz]

There will be copies of all the albums on CD but the external hard drive is for backup.
Also the reason for external drive is to allow for mobility. Hook it up to a laptop for example to show couples there photos rather than take them upstairs into the bedroom PC