Lowest price this highly regarded gaming mouse has ever been on Amazon by around £15. Just ordered one myself.
A quick google of reviews for this mouse speaks for themselves.
Some specs from Amazon:
Up to 7000DPI
MAX tracking speed of at least 5.45m/sec (215 IPS)
No positive or negative hardware acceleration
ADNS - 3310 gaming grade IR-LED optical sensor
Gold Plated, Full speed USB 2.0 connection with Plug and Play
Link to Mionix website: http://mionix.net/mice/naos-7000/