First of all, I say "wired" because I know my wife does not want to switch out batteries or place it on a cradle...secondly she spends most of the time browsing so it would need to be one that has easily accessible back/forward buttons...I am tempted by the mx610 that is majorly on sale at BB right now but I've heard some people have problems with the mouse pointer getting "jumpy" which I would hear to no end about from her if ours did that...