Gryzor: I think you sold Red on me - I am getting a GTD. I did have a MK5 Golf GT in Black Pearl and it looked great, but the GT didn't have any stand-out "performance" features that were lost in the colour. My next car, a Golf GT Sport did, as it had the black gloss nose/grille bit liek a GTI, and it was in Tornado Red. It looked great, for about 2 weeks until a bus hit it with all of 405 miles on the clock. Benfield VW did such a poor job of repairing it that I resented it until I got shot of it for my first Roc in Pewter Grey (great looking shade of grey - it has that slight pruple hue about it).
Red it is, unless my dealer says it is too late to change (doubtful). Black is a poor choice on the Roc, it really hides the curves of the car, especially at the back.