Difficulty Level
Expert
Armour
Heavy no smith perks used and only improved once to fine.
Weapon
Two handed improved to fine.
Magic.
No magic used with the exception of alchemy and restoration.
Alchemy
I have a self imposed rule of no potions or poisons to be used during combat. The exception would be hiding behind something and applying poison to a bow when in an archery duel.
I find this to give a good blend of challenge and pure head chopping off take that you milk drinker fun. What do you feel gives the right blend of challenge and fun to make your game enjoyable ?.