Alright. My two year old Logitech MX518 isn't holding up to wear and tear very well, which worries me, since I have two of them, but the other one is still in decent shape. The coating on the plastic parts begins to peel off and this is annoying me to no end. I need a good gaming mouse, with the following requirements: At least 4 buttons, preferrably six. Adjustable sensitivity on the fly without a driver. Something that will last for a LONG time. At least as sensitive as the MX518. Can someone help me out here ? Thanks.