My first gaming mouse was the logitech G5 which was an awesome mouse after a little getting used to. Once that had reached the end of its life I upgraded to a logitech G9 (not the 'x' revision) and after an inital settling period, it turned out to be fantastic to work with. If you have slightly larger than normal hands then you will find this mouse a little harder to use at first, but it is fantastic for precision gaming.
I've recently upgraded however to the RAT 7 and after some tweaking and playing around, this mouse is freakin sweet. I had to download a fix to remove the mouse acceleration from my registry as it was making it hard to aim at people in FPS games. This was due to people jumping out at me and I would spin around to shoot hem and would go WAAAAAY too far round.
Whatever your choice, please bear in mind that using a new mouse will feel like you are wearing someone elses trousers for a week or 2, push past that and actually experience the mouse before you decide its not for you.
