doing a bit more digging there are some other decent car-based tall wagons with 3rd row seats that are worth considering buying used as well:
- Toyota Highlander
- Caddy SRX wagon
- XC90
- GMC Acadia

Could even get a 2WD version to make me feel better about less overlap w/ the X5! ha..

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9