I've special-ordered two 3 series without sunroofs, simply to gain the headroom. They were both ordered with manual seats as well, as that gains another half inch or so. I needed both in a 3 series.

I couldn't buy an E39 without a sunroof (too difficult to order it, when I wanted it) and that was why I got the X5. I am fine in my 2003 X5, but I sat in a new X5 a few weeks ago, with the pano sunroof, and my head was against the headliner.

A regular sunroof usually costs about 1", the pano sunroof seems to use up another .5" or so additional.

I am 6'4". This is all a drag, since I like how a sunroof brightens up a car. With my next vehicle, I am going to investigate getting the seat lowered, some models have kits available.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue