Hello and welcome to the forums
Well i have Logitech G9 with Razer exactMat mouse pad and i love it, however there are newer models too.
For mouse,Logitech G9/G9x or Razer DeathAdder are pretty good for gaming, and for mouse pad, Razer Destructor,Goliathus,exactMat are good.
G9 isn't the best,the mouse from Logitech is currently G9x.
Are you asking for a recommendation or do you want a MX518 and want others to accept you ?
Provide a link that proves MX518 is better than G9/G9x(specs wise,not handling)
In U'r opinion Logitech is better than Razer DA?
I probably try this QPAD CT. Now I have Qck and I want something better
Hard to say which one is better.
The Deathadder has a much better scroll wheel.
The logitech feels more precise in shooters.
You could do alot worse they are both very good mice.
Btw i have buddies who love their G9's.
I'm just relating my personal experience.