Just to put it out there, if you don't want to clutter up your desk with a joystick, you can use a wired Xbox 360 controller. Pretty cheap alternative and easy to set up. I use the left and right triggers for rudder, since ArmA recognizes those as the yaw-axis you would see on a joystick.
Took me about 5 minutes to get setup correctly, and about the same amount of time to get used to.
I did this since my faithful old Sidewinder Force Feedback 2 finally met it's end. :'(