The Nurburgring is a bloody tough track and is fun when you get it right,
I bought the Gran Turismo Special Edition, and got the Bugatti Veyron. I can tell you one thing, that car isnt built for that track at all, it barely stays on the road on some parts. I managed to get a 6:52 around the Ring in the Veyron, but i reckon some cars with half the power of the veyron can make it around the ring in the same time cause they are a little bit more flexible, and you can hold the speed with them around the corners a bit more.
Im really loving this game atm, especially the drift challenge option.