The only option I didn't get that I kinda wish I did is the auto tail gate. I have an E53 (until the end of the month anyway!) also and the tail gate on it is quite different. After using my new E70 for a couple of weeks the tail gate is different and I think in retrospect the auto tail gate would be a useful (and cheap!) option to have.

I might have also skipped getting the running boards... I didn't get the 20s and without them the running boards make my 19 inch wheels look kind of wimpy.

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Current Cars:

2008 X5 4.8i - Blk/Saddle
2001 330Ci - Titanium/Black Sport/Premium

Past Cars:
1993 325is Blk/Blk Sport
1995 M3 Blk/Blk
1997 328iC Blk/Blk Sport/Premium
1998 M3 Silver/Black
2001 M5 /Black/Black/Sport
2005 X5 3.0i - Blk/Blk Sport/Premium