Mice are more accurate than joysticks; ask Smitty - he will tell you.
Now that we have gotten that out of the way. The new splitfish controller is out for the 360 this week and I have to say that I am kinda jealous. As an exclusively PS3 household we don't get these super PC gamer focused peripherals. I was born on the PC as a gamer and everyone is much more precise with a mouse than they are with a joystick...
Intrepid PS3 players have an option with the Piranha from splitfish - but it is riddled with wires. Perhaps a wireless version is in the works...
http://splitfish.com/index.php/en/products/fragfx-shark-360
