give up trying to kill if youve got a wireless mouse...
its bad enough with the lag from client to server, you dont want hardware lag your end aswel.
also, dont get a huge fat mouse, the lighter and more moveable the mouse the better.
Microsoft hardware is pretty good, dont use their shit software tho.
for some strange reason most hardware like mice and keybords all come with applications that run in the background.
i had 1 with my microsoft mouse, dont know why, no special features on it, just a standard 2button + wheel, but, as i moved the mouse my cpu usage went up as this program was "processing" my movements.
ive now removed the software and im using just "normal" drivers, all works fine, no cpu usage.
if youve bloated your system out with all diferent mouse drivers all running in the background it wont help your computer, so i hope youve removed them.
http://www.razerzone.com/simple, light, perfect for games