I like the W140 a lot and am thinking about maybe replacing my SDL with one if it doesn't stop needing constant work. I am seeing a lot of very nice 1994 and 1995 S420's and 320's for sale in my area at great prices. I would like an S320, I6's are simple to work on and I don't really want a lot of options because I have to fix them when they break!
A base S420 or S320 with about 100k miles on it with a full maintaince history is looking pretty good now.