Another point to consider: gas mileage.

2002 E320 4-matic 25K mi just did 29.0 mpg for an 80 mile round trip on highway, avg. speed 69 mph, windows closed, sunroof tilted open, a/c on, very light winds, no passengers, easy driving style, Sunoco 93. Looking thru the gas mileage thread, I don't think you'll get that with an IL6.

I find it hard to imagine a smoother running engine than this V6, but since I've never driven the IL6 I'll just have to take the word of those who have.

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2002 E320 4-Matic
2008 Subaru Outback
2009 Subaru Forester