I have an original 1800. Deathadders are tried and true. When in doubt, I say go with a DA.
I have an Imperator, but I don't use it. It likes to randomly stop working, making me have to unplug and plug it back in. Very frustrating in-game.
Avoid mice using the Philips Twin-Eye sensor, This includes any recent laser mouse that is a Razer. They track extremely well, but they have what's called the Z-axis tracking issue. Every time you lift and set the mouse back down, the cursor will move diagonally down and to the right slightly. Not a big problem if you use a hard surface, but using soft pads can cause aiming problems because pressure on the mouse can mess with your aim.
Logitech G9X I've heard good things about. I think they fixed the acceleration issue that plagued it. When you move the mouse at a certain speed, it ramps up. The Xai uses the same ADNS 9500 sensor, but I don't know if they fixed the acceleration issue.
Edit: Just saw you want wireless. I'm don't like recommending wireless for gaming, but get an Orochi I guess. Just don't put it on a cloth mouse pad.