hmm.. lets see...
S500 W140 (dunno much about the engine.. but i rode in one.. and i liked the way it rides and also how it looks)
560SEC W126 (definitely one of my dream cars)
300TDT T123(unfortunately mine is not turbo) or 300TD T124
of course the choices i have is all a matter of MY preferences.. now if one of them is a problematic car due to engine performance or lack of body integrity.. well.. i like them anyway...