If I recall correctly undertheradar disliked Logitech mice and I think he rated the Gigabyte m8000x his favorite at one point in time...hey undertheradar, in your opinion which is the best out of ....
logitech g9x, g500
gigabyte m8000x
im really torn between the three and seeing how you have a lot of....hand time... with them which do you prefer?
That being said if I were you I would go for the Gigabyte, it just looks like a much nicer shape for your hand (looks a little like IE 3.0/Deathadder shape) when compared to the G500. Also if I'm not mistaken all 3 mice have the same sensor...
I can't comment on the G9x other than that it's made for claw grip gamers, the G500 for palm, and the M8000x may work for both styles of grip (closer to palm from the looks of it).
The other nice thing about the m8000x is that on newegg I think there's a little rebate and it comes included with a large gaming mousepad that looks really attractive to my eyes (large, cloth).
I would definitely go for the Gigabyte.