If you had access to lower mileage type S parts

Hello guys/gals. My '07 TL/Tech is about to hit the 180k mark and I recently ran into a friend parting out an '08 TL-S with 34k. IF you had the opportunity to swap suspension parts for the sake of NOT spending the cash on new what would you snag? I don't want to get parts that I COULD get better in the aftermarket category, however I am not sure what the life line is on things like wheel bearings, control arms, steering rack, etc... I am just trying to be preventative rather than reactive on my cars maintenance while taking advantage of an oppertunity.

Thanks guys.

Jesse