Pretty much the top 3 on the market are the G9, the Razer Lachesis, and the razer Deathadder. The real differences are shape, the side mouse wheel on the G9, and that 2 of the buttons are on the right side of the Lachesis, I personally dont like that location and prefer them under the mouse1. they say the Deathadder is the best as far as smoothest response for a serious FPS player, but my G9 is pretty smooth.
