It depends on what you want to do really. What would you be doing with either 99 Magic or 99 Ranged. As far as I know, you can get 99 Magic while profitting by the way, alching is profitable now, at least on some items. You won't have to spend a load on that. Anyway, give me a reply to this.
Same goes for herblore, what would you do with it? If you are going to boss, I would go for Herblore, but don't get 91. I'd go for at least 94, making overloads with stews is a pain in the ass, even with 94 Herblore. +5 boosts are really rare so don't go for 91.