The GTI has a pretty good standard spec, so I’d personally not be going over the top with the options.
I’m also not a fan of White Silver, but I do like Pure White. White Silver does seem to divide opinion; to me, it looks as if VW stopped after the primer had been applied and forgot to apply the colour coat. As davyk31 has said, colour is a very personal thing and one person’s favourite colour will be another person’s least favourite.
Brescia wheels look good, but I do wish VW would stop forcing diamond cut alloys upon us! If I was speccing a new Golf, I’d go for the 18” Seville Dark Graphite wheels, as I like graphite/anthracite coloured wheels, and being powder coated, they’re more durable than diamond cut alloys - especially for winter use.
I’d definitely go with the traditional Jakara tartan cloth seats, which are part of the GTI’s heritage and IMO makes the interior special.
Sunroof - I personally wouldn’t spec this, although many owners on the forum that have one wouldn’t be without it. Quite a few discussions on golfmk7.com forum of (USA) owners with sunroofs experiencing rattling noises, water leaks, stress fractures on the glass surround above the A pillars and interior sun shade that won’t stay closed. Maybe these issues are specific to Mexican built Golfs for the USA market as I’ve not seen similar issues reported on this forum.
90% tints; they’re a cheap option, but I’d stick with the standard tints.
Rear view camera; I’d spec this, as I suffer from back problems so I find it useful when it’s painful to look over the shoulder when reversing.
Keyless; I wouldn’t spec it, but many owners on the forum have it and wouldn’t be without it.
DCC; I’d choose the 18” Seville alloys so wouldn’t feel the need for DCC, although again, others who comment on your spec may have different views.
Climate screen; useful if you don’t garage your car, but does it really take long to scrape the screen? I have friend who had one on their Ford and it was really effective. I’ve no experience of the VW climate screen though.
Dynaudio; I had it in my mk6 Golf, and I was a little underwhelmed with it. The Dynaudio system in the mk7.5 is no doubt an advancement over the mk6 version. I’d recommend you take a test drive in a Golf with and without Dynaudio so you can judge for yourself.