Logitech makes a solid mouse but I'd never go wireless. I use a slightly older model of that mouse and it's pretty good but lags from time to time. If you can find the same one but wired, it's a very good mouse.
Razer also makes some good stuff but your not going to find a mouse/keyboard combo for under $100.
http://store.razerzone.com/store/raz...oryID.35208800