I'll take a W211 in a heartbeat if i was offered the chance.
If I was to pick a category for everything, this is how it will go:
Styling: W124
Performance: 320 CDI
Reliability: W123
Safety: W211
And another reason why I will like a E320 CDI, lots of "acquaintences (sp?)" say "ewwww... diesel"
This will shut them up for good. :p