Audi (get a pre-owned with a warranty and you're set)
BMW 3 Series
Mercedes C class
Jaguar X-Type (my mom has one and it's awesome)
If you're excluding minivans, SUVs and pickups the above are the best options. Try to buy one that is just coming off of a 36-48 month lease and you'll probably be able to buy one that is a certified pre-owned with a bumper-to-bumper warranty. Good luck.