As said, it depends on how careful you are during the washing and drying phase.
All cars get swirls but obviously the darker the colour, the more swirls show up, with black being the worst of all and silver or white best for hiding swirls.
Whilst it's nearon impossible to avoid swirls, with a careful cleaning regime and the right equipment, it is possible to reduce swirling. Light swirls and surface scratches and marring can always be polished out once/twice a year if you want to.
You mention carbon grey and I think that colour would be a good compromise if you want to stay on the darker side but not have the pain of maintaining black or dark blue. And it's a beautiful colour too. Agree that Tungsten great for hiding swirls and the silvers seem to really suit the sharp lines of the mk7. I wouldn't consider Limestone Grey to be a dark colour though, more on the lighter colour spectrum.