I've been looking around for a slightly used Bluetec and am thinking I'm down to these two models: 2012 e350 or 2012 S350. Does anyone have any insight as to why own one over the other? For instance, are there absurd hidden maintenance costs associated with owning the S-class in this model?

Thanks, in advance, for your insight.....

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Craig

2011 e350 Wagon < Grey on Grey/Brown. I kind of think I'm cool driving around in this thing, but I know I'm wrong.
2007 e350 4Matic Wagon < Black on Black
2003 e320 Wagon < Black on Oyster. Dog Hauler. Replaced at 170k. Great car!
1990 300SE, Black on Black < Totalled
1991 560SEL, Black on Black < Current, sits around a lot
1972 280SL < Sold, but not forgotten.
1972 280SEL 4.5 < Gorgeous car. Lost to a freak accident.
1985 300TD < "Merzilla". Put 300k on her.