Mbenzer,
I really wish I could honestly advice you to keep your car and hope for the best, but with these cars unless you can confirm that the rods or the block have been replaced with defect-free one(s), I'd say your safest bet is to sell the car. I've come across one of those engines that only threw its rod at 280K. Very high mileage by any means, but in these cars you really can't tell when it will happen. I have heard of some that went through the same thing at 70K, some at 120K, etc. I currently own a 1995 S350 with the same engine that bent its rods at 171K (check out this thread:
http://www.peachparts.com/shopforum/showthread.php?t=116994&page=1&highlight=S350). Basically, you can't tell when it will happen and unless you can verify that the problem has been solved in your engine, you can't tell if it will happen to your car. Enjoy the car for now and start planning to sell it as soon as you find an MB equipped with a diesel engine that meets MB's engineering reputation. For instance, if you insist on a W126 diesel, then that would be either a 300SDL (1986-1987) or a 300SD (1981-1985).