The main competitor to Logitech's famed G5 gaming mouse, Razer's DeathAdder boasts better axial accuracy and greater customizability--differences which you may enjoy discovering in splendid detail over at sister site CNET Reviews. Please note, this mouse is made for right-handers, so lefties may have an issue with the thumb buttons. Check out the full review for information on system compatibility before you buy.
Not an avid gamer myself, I can only point out that the mouse sports an intimidating reptilian name and a neat glowing blue tri-snake-ular logo. Allow me to quote from colleague Rich Brown, who provides this far more useful overview:
"The good: The Razer DeathAdder gaming mouse has high accuracy and includes excellent customization software, and two responsive thumb-side buttons (righties only).
"The bad: No Vista driver despite claim of support on the box; no dedicated button for cycling through DPI settings on the fly.
"The bottom line: Razer's DeathAdder gaming mouse is a powerful accessory for fans of 3D shooters and others who might demand a high degree of customizability in their mice...the DeathAdder performs exceptionally well."