The G502 Proteus Core is a great gaming mouse. Now you can change the colour it lights up with the G502 Proteus Spectrum!!
Bit of a gimmick with the lights, but it's still a good mouse and this is the best price I've seen the Spectrum version for, on par with the usually cheaper Core version (which Maplin sells for an overpriced £69.99)
£55.99 (free P&P)
(Same price on their ebay page, but lacks the cashback options)