Then I'd say Agility, Cooking, Smithing or Crafting. Smithing and Crafting obviously need quite a budget, and I personally don't understand people who think Agility isn't monotomous. Therefore I'd say that your best bet would be 90 Cooking. It isn't what you'd call respectable, I know that, but the sad thing is that the most monotomous skills are usually the most respectable.