I bought a genuine M-B battery at the dealer; cost only $120 (about $20 more than what I was finding at Sears/Interstate). Replacing the old one was a snap, and the car fires up beautifully now. I'm going to do some testing with the ammeter to make sure everything is OK, but it looks like my problem has been solved.
Thanks to everyone for your help. This is such a great resource.
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