You gotta get a mouse that feels right. If you have big hands, then don't get a small one, or the other way around.
You won't need many mouse buttons like the m95 or the g700 for FPS gaming. It's more for MMORPG's and such.
You would probably want a mouse that lets you change sensetivity. I don't like mice that has a lot of buttons, so i keep it simple.
The Corsair M60 is a FPS mouse, but i haven't read reviews on it, so that's for you to do. Anyways here it is:
http://www.corsair.com/en/vengeance-m60-performance-fps-laser-gaming-mouse