You really need to sit in one configured as you will purchase it. I found a real lack of headroom in the E70, due to the panorama sunroof. It had less headroom than my 2003 E53. I am also 6'4", but it depends on more than just your height, it is about where your length is (legs vs torso). I like the seat upright for my back comfort (and the comfort seats are the best option IMO)

If you are getting running boards for the looks, great. If you are getting them for function, try them out first on a wet day and see how disfunctional they are.

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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