I signed up for the BMW Drive event in Portland Oregon in 2 weeks and my comparison car is to be the RX350 against an X5. I chose that just a point of reference. I'm also going to drive a new 5 series against a Mercedes E class. You get $1,000 from BMW towards purchase of a new BMW (by 10/31/2011). Never done this but sounds interesting...

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red