not much of a fan of Razer, it has to much hype for the products they sell.
not saying it is bad i am just saying there are better ones for FPS
i do say i like their MMO mices though
for FPS i really like RAT miceshttp://www.newegg.com/Product/Product.aspx?Item=N82E16826201005
decent pricing, high DPI(which is needed for faster reactions) and has a slow down option to make a more precised aim
also this mice is pretty nice my friend has one and it fits my hand really nicehttp://www.newegg.com/Product/Product.aspx?Item=N82E16826816006