123 chassis 300d's make super DD'ers. As do 124 chassis cars in general. 190e's that have had good care taken of them are nice 'muter's as well.
Whatever you choose to buy (diesels are great for long runs to work) get it checked throughly by a good shop including a compression check on anything over 100k. I'd stray away from 116 cars as parts can be tricky and the number of people who really know those cars is fading.
My personal favorite is the 92-94 300d 2.5 turbo but, finding a good one is tough at best as most folks have run all the good stuff out over the years.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.