I could probably be persuaded to drop $600-800 or so and buy a Chinese Xentry DAS system. Can anyone make a recommendation as to which package to buy and from which vendor?

Here's a recommendation from someone over on Benzworld.

Nervous about buying Star diagnostics from China? Look here... - Mercedes-Benz Forum

Whatever I get, I'd want it to be "turn key"....laptop, multiplexer, cables, etc. for both W211 and W210 all as one package.

Thanks.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

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