Hi.
Regarding the sunroof:
If you've got kids sitting in the back, I'd 100% get a sunroof.
IMO (based on test driving one with and one without on same day), the GTI mk6 has them tinted windows in the back, and the sunroof car let in a lot more might, the glass roof made a world of difference in terms of light. Our little test driver in the back pref'd with sunroof so we opt'd for one (also the light in the car did make it IMO a nicer place to be). In terms of drop in the hight of the roof, I'm 6' 2" and no problem there (our current mk5 has a sunroof and it was a no-brainer option for me). Dealer also added a lot of people with kids opting for the 5 doors car also spec the sunroof for the same reason which was interesting. It's made no difference to our delivery for 100% on for 1st March.