Stick with a PS/2 mouse. It provides the fatest, easiest, cheapest solution to any mouse need. Doesn't matter the number of buttons, wheels, or stickers, the old, reliable ubiqitous mouse is still the best item never needing an upgrade in the game.
I work as a network Tech at the University of Michigan, and have seen nothing but trouble with the optical (wireless) mice. Everything from proximity woes to reflective interference, from sound and video card compatability issues to IR config duplication, the wireless age is frought with errors.
If a PS/2 mouse fails, replace it with another $8 mouse. Drivers are generic and universal. PnP and GMouse work in both DOS and Windows (as well as OS/2, Linux, BeOS, etc). Stay with a winner!