I am in no way a GTR "fanboi".
That being said, comparing a top of the line model Viper to a base model GTR is like comparing a midget to a giant in a size competition (that was really bad). I love vipers, I have driven one and it was an absolute blast, but you just have to look at it from a price and model stand point. Awesome, they beat the GTR...but now they have to hope that the top of the line model of the GTR doesn't beat them.