Can anyone shed light on what's the best way to renew the feel of the suspension. I know I need shock and and struts on my '02 X5 4.4 w/self leveling suspension. Is it worth puting new springs and or air bags? Is the air bag more important than the pumps that feed into them? I get faults, have them cleared, replaced a sensor, etc.

Aslo, the dealre told me my front control arem busings arm busings ar ebad which I can feel the slop especially in and around the parking ramp and speep bumbs. They quoted me $650 which is par for the cours from a dealer. Is it easy to do for oneself? Is it worth doing any other bushings at 100 k mi even though they supposidly appeared o.k. druing the visual inspection perfromed?

Thank You!