After a few weeks of looking around, I finally came down to 3 mice:
Deathadder 2013 : http://www.amazon.co.uk/Razer-Deathadder-Ergonomic-Gaming-Mouse/dp/B00ABS62C6 £47.99
Logitech G400s : http://www.amazon.co.uk/Logitech-G400s-Optical-Gaming-Mouse/dp/B00CJAEX70 £33.30
And the Logitech G400 ...