I had a similar dilemma when ordering my car..
320d M-Sport Business Nav, SPG, Business Loudspeaker, Lumbar
318d M-Sport Pro Nav, SPG, HK, Xenons, 19"wheels and Lumbar
For me I took the power, as others have said ultimately a car is about the driving experience, the gadgets are the icing on the cake but IMO don't ultimately define the experience.
7 months on and 23k miles and really happy with my choice and thoroughly enjoy driving my car.
Good luck with your choice