I love my Dunlops. They are very comfortable, quiet, and grip well in rain and snow(in Mich.) They wear evenly and at 25000 miles, have plenty of tread left. And at about 60% of the cost, I plan to stay with Dunlop IF I get get 50,00 miles out of them. Generals on ML's ride a lot worse: I test drove them both before I bought my ML320. Also, in my opinion, I'd stay with the stock size. You are already top heavy enough.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback