Logic dictates that, based upon your criteria and data outlined in your posting, that the 300SD is the best car for your needs, based upon style, comfort, longevity, reliability, fuel mileage, condition and price.
(Thank You Science Officer Spock...
...)
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"We drive into the future using only our rearview mirror."
- Marshall McLuhan -
Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."