I think on 'paper' the ML250cdi and say the CLS250Cdi just sound wrong...
£45K upwards on a car and its seems odd having a relatively small engine. However as the owner of one has said you would have to drive one. 35+ mpg is pretty good for a big bus.
I've now had the W163 ML and currently just bought a W164 ML so slowly going through the range... Much more rare (at least round here) as RR sports and Discos seem to come free with cereals
I actually think it looks great in white (sport) with Pano roof