ive used the 2nd gen WoW cataclysm gaming mouse, which is pretty great for what it does, but right now i'm using the 1st gen razer naga 17 button mouse, works pretty good, but the buttons are a bit closer together. however, i know they have one out now called the razer naga hex, which spreads the buttons out a bit more. but always remember, you're not limited to just the number of buttons on the mouse, you can always do ctrl alt, and shift modifiers, which immediately quadruples the amount of buttons on the mouse, not to mention combinations of those modifiers.