Very much a catch 22 here. I wont know what radii to put on the anvil until I start working and get experienced, but I could go through bad experiences using the wrong radii.
Did more research this afternoon, and yes there is no single answer apparently, totally dependent on the work at hand.
As it is a post anvil I can reverse the anvil as it effectively has two primary striking surfaces, call them "A" and "B". I was thinking of having either the same radius on "A" and the a different radius on "B". Or I could have two different radii on opposite sides of the same striking surface, effectively giving me 4 different radii on the anvil.
I need to start somewhere so anyone care to give a stab on the radii. Lets assume that I will forge blades for hunting knives and will make tongs for blacksmithing as well as implements for the BBQ like tongs, forks, kebab skewers perhaps some light work like light chandeliers for my fire pit.