We have a set of Nokian NRW's on the E320, and haven't had the chance to try them in snow / ice yet but they are fine on dry pavement and in the wet. We used to have a Volvo 760 Turbo wagon (rear drive) with Nokian Hakkapelita's, that went great in winter, so expect the same with the E320. Also have a set of Nokian WR's (255x65x16) for our Range Rover, not that it needs snow tires but they came with it, so defintely a Nokian fan.

I think of the tires the same way I think of the cars:
Bridgestone Blizzak--American
Kuhmo--Asian
Nokian--European

Which do you think performs the best?

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro