New mouse reccomendations Options

[K.]

anyways last year i bought myself a razer copperhead in blu

but a year on the left mouse button is a bit duff, the microswitch is working but the button is not springing up at the tips enough so it's causing me to have to press the button harder :/ (i know i know the indignity :S)

ok it's specs are 7 buttons (need at least 5 i think)
2000dpi - same or above plz
1000hz ultrapolling - i dont really notice the diff between 125,500,1000 anyways :S
and it has a really sweet mousewheel

so can anyone reccomend a new mouse with roughly the same specs or better at a reasonable price ?

i dont really wanna go more than £50, so plz dont tempt me with a razer mamba unless you have a cool link to a reputable place that is doing them for 50 bar !