Uh oh, what have I done..
Specs do look good, not fussed about sun roof but do like the mod cons like climate control, digital dash thing, parking sensors, heated seats etc but especially a good sound system.
I did hear that Golf Rs a bit cheaper to insure. Im not really a speed merchant so R model does seem a little overkill for me.
I'd be surprised if the R is cheaper to insure with 300bhp, and it's the most stolen hot Golf (unfortunately).
All those items you mention with the exception of the sound system are not options as they are standard fitment to ALL MK7,5 GTD's, GTI's & R's, along with, LED headlights, Led taillights with sequential indicators, minimum of 18" alloys (UK market only) auto lights, auto wipers, Bluetooth, minimum 8" infotainment with navigation, Twin SD card slots, CD drive, USB Socket, front seat lumbar support and seat height adjusters etc.
Later 2019 cars also got rear parking camera, keyless entry, adaptive headlights, lane assist etc. If you can bag a later 2019 one, it comes pretty much loaded (be that a GTI, GTD or R).