I would say if you are used to moving the mouse very fast, stick to something in the gaming realm, which it sounds like you are. But 2 main reasons, they don't usually turn off when they stop moving, and you get a high poll rate on the USB, so you can't move and click faster then the mouse can register.
I have a Logitech G400, and I would not call it great. I'm just used to it because I used the MX518 for awhile and this is basically the upgrade to it. I tried I think it was the G9X awhile ago and the scroll wheel was too difficult for middle clicking.
As far as best mouse? That's too subjective, IMO.
And as a side note, I want to try one of the Corsair mechanical keyboards, if anyone has experience with those, please share. I have a Logitech G15, and the button stroke is WAY too long for a gaming keyboard.