Of the three you listed, the 08 X3 is the one I'd be interested in. The LCI E83 is just a nice vehicle. I love driving it and considered getting a second one for myself to drive daily. Alas, I need the towing capacity of the E53 and seating postion fits my long legs better.

AM.

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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)