Spec is so much down to personal taste. I do like the carbon grey, but much prefer the tartan cloth upholstery. I think the Golf interior can be a bit bland without them.
In 3 door form with 19" wheels it will certainly look the part, but I'd have spec'd DCC purely because I drove a loan 5 door GTD with the Santiago wheels and the ride was a bit hard on the roads where I live. Not unpleasantly so, but enough to think the DCC would have been worth the extra. Having said that if you're using it on the Motorway a lot I think you'll be fine.
Performance is an interesting one, I personally don't find mine particularly satisfying to drive fast. You have to be right in the thick of the rev range and this is where the diesel drivetrain is at it's most unrefined. On a motorway it's great, smooth and plenty fast enough.