In the more controlling builds:
Is goblin guide still the best choice? He certainly is great in the aggro/burn builds because he is basically a burn spell that has the potential to deal more consistent damage.
However, I sometimes feel he is a liability in the controlling builds. Giving them land which helps their board position and can hinder your dazes/spell pierce. He also isn't evasive like delver, which means he has trouble going the distance later in the game.

I've been experimenting with mogg fanatic for a bit because he seems to fit the strategy better for the counter builds. He takes out utility creatures, still swings in when there are no blockers, and can go straight for the dome if necessary (getting rid of bridges is nice too).

Cons are: he isn't very big, so he can't do nearly as much damage as guide can. He can't trade with X/2s anymore. No haste (although *slightly* offset by his sac ability).

Obviously, I'm not sure if it is the right move yet, since guide can still set you up in the early game for a win in the later game, but I wanted to hear other people's opinions.