Let's see... I'm going to be very general
SL R230 - This car is just drop dead gorgeous. I don't care if every kid in Boston has one, it's just so nice to look at. It's also amazing inside it.
E Class W124 - same reason. it looks good as a coupe, wagon, convertible, limo, sedan..so many of them in the world yet they are still prestigious - and yes I'm biased :-D
S-Class W140 - The W220 looks nice and probably drives better blah blah blah. It lacks the W140's presence and Benz-look. Especially in long wheelbase S600 V12 form

48-valve V12.. lovely
there they are..
gonna add a 4th
The W211. This car is also beautiful. I love it inside and out. Especially with the V8s or the new 400CDI V8