I have a very old, very generous friend who invited me to his track. I was able to drive a 720S and a 600LT. 4 months later I owned a 720S. Once you have it you will sell the R8 in my opinion.
I agree the AP setup is superior. The un-sprung weight savings alone make it superior to other cast solutions. In addition, you don't cook the stock calipers. Finally, it can be sold when you move on.