I was set on Atlantic Blue and even got the dealer to sound out any in the VW network, but I slept on it and started to get interested in Isaac Blue.
It was a colour I had previously dismissed but reading in the forum here, it got a lot of positive vibes.
So I did switch last minute to Isaac Blue and my dealership had a car actually at their site. I love the colour but under typically UK cloudy skies it often looks grey rather than showing off the blue.
Admittedly I do love Atlantic Blue also, but have no regrets with Isaac.