any mouse with a left and right click is good enough! just buy whichever you feel comfortable with your hand on. there isn't really a 'gaming' mouse. just buy which feels the best for you.
as long as its a 2.0 mouse it does not matter what brand but i prefer a corded one as there is nothing like trying to change batteries when your getting shot at
I have a A4Tech X-718F and i´m really happy with it.
I'm Portuguese and here a G5 costs up to €50 and a G9 up to €105 and my A4Tech was €24.
In my opinion, this mouse is better than a G5 but it's just my opinion
By a Razer Deathadder, it's danq. Looks good, killer dpi, 5 customizable profiles, 2 extra programmable buttons. It's amazing I have been quite pleased with it's performance.
There's one that's got to be more of a practical joke than anything, but they sell it on Thinkgeek. It's a mouse with a built in fan so your hand doesn't sweat.
As dumb as I find this idea, one of my friends had the mouse and it actually was a great piece of equipment (The whole fan thing aside). Lots of customizable buttons and a good contour. It's nothing super special, but it gets the job done.
I have one of the logitech mice, either the g5 or the g7. I meant to get the cordless one, with the quick change battery packs, but i got the corded one instead :-P The weight cartdridge doesn't have any noticeable benefit. Perhaps i'm not "Pro" enough to tweak my mouse's "heft"