Find a 190D with the 5-speed transmission. I had the smallest of the engines (2.2L), mated with a 5-speed, and I could reach 100mph. Obviously, reaching that speed would take a considerable amount of time, and you would never want to cruise at that speed if you wanted the engine to last.

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Ed
-1984 Mercedes 190D 2.2 5-speed gray market(bought@30,000 miles) (Sold back to original owner@170,000 miles)
-1999 Mercedes E300DT (245,000 miles)
-1999 Mercedes S500 Grand Edition (80,000 miles)