I think your current tone is much more flattering on you than blond would be. Your dark brown color helps create a contrast in your fair skin where as blond hair would blend in too well. The maintenance on blond highlights are also a lot harder to keep up with. This color looks great!
I think your dark hair is just beautiful!!! Hey it worked for Kim K. I say to own it & love it!!! You could ask your hair dresser for a clear glaze, to really shine it up. But why bother chasing the roots from dying it blonde or red???