I have a family connection with a local Ford dealer and have been thinking about taking the plunge and getting a new GT350 - possibly an R-model if he has an allocation. Those of you who have either, is there a significant difference when street driven? Is the R as good or better than the GT350 on the road or do the differences only come out on the track? Does the R give up anything to the regular version on the street - i.e., more harsh?