Skills for an Inferno hero.

I also think it's necessary to know the final build in advance, both before and during the game, and to aim for it (rather than improvising as you go). If I want to develop only 4 abilities, then there's no need to take the 5th one, even if it becomes available. And I should max out those 4...
But in your opinion, Tony, should I develop whatever ability appears first?