All great rides...they're all on my to do list.
Georgie's recommendation is right on, but be careful...many Brit's bin it in bonny Scotland as the roads are curvy, elevation and weather changes quickly, and they're not prepared for the multitudes of varied wildlife that invariably ends up in their paths. Forgive me, I read entirely too many Brit M/C rags (Bike, Two, Superbike, Fastbikes, etc.).
I have done the Tail Of The Dragon (this past October on my new Duc Hypermotard S)...highly recommended. Many surrounding roads are as good or better than the dragon as well. Bring your Lipitor as the locals cook with lots of Love (and Lard!) LOL! A word of warning about the TOTD: ride your own ride and make sure your bike, gear and head are all together...lot's of people bin it there due to overenthusiasm and/or inexperience.
Cheers,
Kevin