Thanks Kashmir. I couldn't agree more - while I think the 991 looks like an incredible car in many ways, I'm perfectly happy with my choice of a GTS. It really is the perfect 911 for me right now. I'll wait for the special editions of the 991 (especially the GT3) to come out in a few years' time before even considering a move.
BTW I almost ordered the Sport Classic wheels - I think a white GTS with these Fuchs-style wheels (like yours) looks just fantastic. I also like the look of the black stone guards on your car, so I'm definitely going to be considering that as an option.