An update about the MX518 vs G9x. Now that I've been using the G9x for a while, I find it a lot more comfortable. It was nice right from the get-go, but now I really like it. On the MX518 I end up pushing my pinky in since the mouse is more narrow and it makes the right side of my hand want to cramp up when I've been gaming for a long time, if that makes any sense. Anyway, thanks for the mouse suggestions!