I'm searching around about joystick and get several models whit different features and (obviosly) prices, so i'm willing why not ask the professionals...
What's essencial in a Joystick?
For me, I think it's much easier to use in stead of the keyboard.
I don't know for new simulators, but once upon a time when you pulled back for taking off (with the arrow keys) you needed to level it off yourself by using the upper arrow.
You get what I mean?
Now that's why I bought a Joystick.
Besides, a joystick doesn't cost that much money, but if you buy one, I suggest you buy a 'force feedback', it just adds that little extra realism in it.
I still use my old MS precision pro 2.
No force feedback but it has all the necessary features that I would want, plenty extre buttons, buttons conveniently placed, throttle, twist axis and it still works after 5 years (suprising for micro$oft stuff), though i haven't bought flight sims in a while.
I have one suggestion - feel the joystick before you buy it. Make sure it is comfortable. The one I have does not go back to its neutral position very well. That is, it has a slight amount of give and tolerance to move within it's center position. This can make straight and level flight difficult as you have to make constant minor adjustments. Find one the rests rigidly in it's centered position.
A Throttle lever is also great. And a twist handle (for rudder).