OK so which way do you think I should go?

My 535i has got ~125k miles on it and I get a bad shudder at 55mph under braking.

I plan on replacing rotors and pads all around later on this year and would like to concentrate on freshening up the suspension.

So as far as thrust arms go, would it be easier/better to replace the entire assembly or just change bushings? In the Bentley it says I need a special tool to replace thrust arm bushings, which makes me think it may not be worth all the extra effort just to replace bushings.

Do thrust arms "give out?" Any improved thrust arms/other suspension components I could replace that would make a substantial improvement to my ride?