Suspension and mounts are regular wear and tear items however they do tend to go as they are under stress from those massive wheels.
If you are getting that 200k engine (especially 1997) i would drop the oil pan to check for debree from chain guide rails. Would also consider dropping the transmission pan and check there as well. Amount of metal shavings on the 4 magnets will indicate the condition of the tranny.
These two are probably the most expensive jobs. Untreated chain guides may lead to a blown engine (engine swap), and tranny ofcourse having to get rebuilt.
The shops that you are inquring about are RMP and/or Bimmersport. I have not had any work done by either of them but many on this site like the work they do.
You never mentioned what model you getting. 540i?
E39 540i Sport