The top mice makers (i.e. microsoft, logitech, and others) have excellent gaming mice. You can look at the reviews.. Then go to computer shops like Best Buy, Fry's etc that will enable you to try it. Get the feel of the mice w/ your hands.
Wired mice always perform better than wireless although there are great wireless gaming mice that came out.
Specially on on-line first person shooting game... Can't afford the lag time of wireless mice.
Read the specs/review... then try it on the stores find out what it comfortable in your hands.