Or why not just change the chain and guides? Not an impossible job, and parts would certainly run you far less than the upfront investment in another car, along with a new set of problems you might possibly inherit. I bet if you pumped $1000 into that car and devoted 2 or 3 weekends to repairing it, it would run like new and would be good for another 50,000 miles.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280