as far as I know, the g9x has a hardware-based acceleration of 10% which can not be turned off by any software whatsoever (all avago 9500??? senors have this built in accel)
@ OP: it really depends on your griptype. I have teste quite a few mice and my 3 favorites are
- for palm grip: Razer Deathadder
(okayish build quality, omron switches, best sensor, no jitter, no acceleration, but a bit too heavy for my liking ... but boxer, MMA, TT1, Morrow, Naniwa and many more use and love it)
- for claw grip: CM Storm Spawn or Xornet
(great build quaility, omron switches, great sensor, no jitter, no acceleration, it's a good middle ground between the deathadder and the abyssus but you may need to get a fitting mousepad for it)
- for fingertip grip: Razer Abyssus
(okayish build quality, omron switches, may have jitter-issues depending on the mousepad and version (LOL-version is the most reliable), no acceleration, lightweight, thats the mouse I'm currently using and beside the poor buildquality I really love it ... also LiquidRet, mouzThorzain, TLO and Haypro use it)
I have tried all these mice and can definately say that they are all awesome
EDIT: Some other options, I unfortunately couldn't try yet are:
- Zowie Mico (bit expensive, no acceleration, no jitter, but heavy buttons (the MX blacks of mice lol), and heavy predition but overall a pretty good mouse
- Zowie AM (great sensor, omron switches, no acceleration, no jitter, but a strange / \ shape which makes it hard to fingertip it