roccat kova, for the money u cant knock this mouse. 
http://www.overclockers.co.uk/showproduct.php?prodid=KB-004-RC

http://www.overclockers.co.uk/showproduct.php?prodid=KB-004-RC

have a look at the Microsoft Sidewinder X8 is awesome :>
That's over his budget.
You can get an X8 delivered for £5 less than his budget.mx518 for the win
I still swear by the Logitech G9. Great mouse. Pricey but it'll last ages.
G5 or G500.
They are both practically the same but the G500 has a few upgrades such as higher PDI and a more solid scroll wheel.
Either way, they are both very good mice.
And for 29.99 it's hard to resist !!
My G9 is totally fine but for this price I think I'll just buy one for the heck of it.
Remember paying like 70quid for the G5 when it first came out.
If only the new G700 was a bit cheaper... it looks promising.

thought id give it a try and see how coolmaster have done
thanks for all the posts guys much appreciated i will let you no how this mouse gets on and what i think in a couple of weeks when i can really put it through its paces
(rts gamer) the weights are a really really nice feature never had them in a mouse but it makes a lot bigger difference then i thought, and are easily removed/concealed

G5 or G500.
They are both practically the same but the G500 has a few upgrades such as higher PDI and a more solid scroll wheel.
Either way, they are both very good mice.