Well to each their own, but I like the Bangle 02-03 e65/e66 7.

To the OP, your x5 is more reliable than the e65 or e66. I think it would be a huge risk for you to trade for that car. Bimmerforums has a dedicated e65 section and you can ask the current and previous owners about this. "you gotta pay to play" is a commonly used expression there.

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2001 E53 X5 3.0 Auto. Silver Black Build date 10-17-2000 141kmiles

2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles