Sounds like you got your mind made up to sell. I would try to find the SD a good home. Not having to tinker with a car might be nice. I find new cars to be dull and too expensive so I drive the older stuff but at the cost of a weekend or late night after work every now and then.

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1980 300CD - 130,000 Daily Driver
1984 300CD - 325,000 Dad's summer cruiser

1977 K10 - The Grinch - lifted, locked, winch, 37's. Beadlocks.. 379 t Detroit Diesel
1956 Willys Wagon - buick 225 oddfire v6
1982 SJ 410