Just be sure the auto has not been in a wreck of any kind if used. NO PAINTWORK. Also be sure the service books are perfect.
I don't know that much about numbers, but if you want a great or near perfect auto, I can connect you to a person that I trust with these type of transacions and I have never been let down by him! PS he located LEE's 500e for him. (Lee is a partner on MercedesShop.com)

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SHOP MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM