The R model is the only "Exclusive" SVT model. I too have been asking this question.
What would you rather have though? An autographed Shelby GT500, and never drive it, or a Y2K R?
If an investment, then what....In 40 years, when you can't push the clutch in anymore......Someone else will have to drive it onto the auction block at Barret Jackson.
I still like the R, and basing the cost of either car today as being the same, $40 to $50K spent today will be better invested on a house. (Can't believe I wrote that). Where's Norm, and the Mike's? We need another canyon run.