You can get the new 2006 530 xi wagon/touring.....Basically, you'll keep the space utility just in case, have AWD ala X-drive, and yes, you'll only have a 3.0L I-6, but it is the new valvetronic engine which produces 255 hp and the power:weight ratio vs. your 4.4i would be even, yet much better fuel mileage......The new 5-series xi wagon would drive like the new 5-series sedan and make the X5 feel like a big bloated boat. Plus, the styling of the wagon IMHO is better than the sedan.

Just a thought....
http://www.bmwusa.com/vehicles/5/530...n/techdata.htm

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