Get a Lexus. I have two, and they simply don't break. The interiors are very nice, too. Unfortunately, IMHO, the front end design of the current models is as ugly as a mud fence. However, the previous generation of the LS model was very attractive, and it had a smooth and powerful V-8. Maybe you could find a well maintained late model. Of course, the Mercedes-Benz S-Class always looks good, but I'm not sure they're any more reliable than your Jaguar.
My GF's Lexus IS350 was nothing but trouble after 120K.