Clunk Clunk Clunk!

[far]

Hi All - Greetings from London


Well picked up the X5 today, on the test drive I had noticed the 'Clunk' which I recognised as control arm/ball joint issue after reading up on this forum( car has done 65k), question is, is there a logical order which things should be replaced?

Lower control arm
Sway bar
Upper arm?

Various members seem to change things in different orders when they hear the 'clunk' - what should I change first? i.e what is the MOST common cause of the clunk?
Would there be any visible damage to the sway bar if I got under there and looked at it?

tia
FAR