2002 325IX wagon or MB E320 4matic wagon?

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I drive a 87 318Ti with a DASC and I do enjoy the car but I also do a regular 315 mile drive throughout the year and I am looking for an ALL WHEEL DRIVE vehicle which has good highway manners and gets fair to good MPG,
I dont want primary front or rear wheel drive, I want all wheel drive all the time,
I have a 1997 Discovery which is great, But at something like 12 to 14 MPG and short wheel base and high center of gravity I have no interest in driving it all those miles,
SO
After much looking I am thinking of a 2002 BMW 325IX wagon with about 130 miles on it, But asking price is high at 9K, I think its a 6K car,
OR a 2002 Mercedes E320 4Matic all wheel drive wagon, also with about 130K miles but about 4K
Both of these wagons are said to get about 26 MPH highway of driven pretty nice, I drive at 75 on cruise control, So I view that as nice,
The MB has more power and it seems as though replacement parts are about the same price for regular maintenance and upkeep,
Both are good for high miles if taken care of, I like the BMWs looks and I like that the MB is a bit bigger and has more power,
They both have 3 open diffs so neither has a limited slip or locking anything, Both use the antilock brake system to distribute power when the roads are slippery,
WHats your opinion on these two station wagons?
Peter