43 Golems were defeated by a single Centaur with Support, just for fun.
Now, about the topic.
For the starting lineup, IMO, Haggeesh is the best, followed by Krag, and then Arghat/Tilsek (why did they give him Strength against Magic? He doesn't need it for fast games...).
But there are also specific situations: if Arghat and Haggeesh appear together, then, as MDans wrote, it's better to play as Arghat, using her to take out the Centaurs...
