I ordered 650s...I am also member on mclarenlife.com....really nice community...if anyone needs more information this is the place to go. I will surely post pictures when the car arrives .
I decided to go for 650s because the price difference between 570s (no discount at the Moment in my area) and 650s ( slight discount) is nearly zero. So it is a personal choice which one to take. I think 650s service will be a bit more expensive as the suspension system is more complex but no one really knows as there is little information about 570s at the moment.

 

That's great, congratulations! I joined up at mclarenlife.com recently, will probably remain a lurker there until time comes to seriously consider a McLaren.