What other car can you buy for $15k that will as reliable as an old M-B.....? Why another late model M-B of course!
If the other estimates also sound like the repairs will make it cost prohibitive, take to your local classifieds or http://www.autotrader.com
to find a "new" M-B to replace your ailing ride.
85 euro-spec 300E twin-turbo 5spd. AMG aero kit
89 300CE AMG aero kit