Either should be fine. Buy the best condition car you can afford. My only other advice is to avoid non turbo automatics. A 240D with a stick is surprisingly fun to drive for a car with less horsepower than my motorcycle, but if I'm stuck with an automatic, I want the power of a 617.950 at a minimum.

Even the turbo-diesels will be considerably slower than the 280SE 4.5 in your sig.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.