As of late, my favorite combination is a mix of zealots and stalker with my favorite unit: High Templar.
Siege Tanks are murder, especially when they have 4-5 of them, but my last game I countered them with having an observer over a hill to see what direction they're coming from as he went siege tank/marauder with medivacs which normally would have been a great combination to eat my stalkers, but when they were duking it out, my high templar blasted them to smitherines and managed to drop em.
Normally I was going to go 1000 random wins to get Maar, but I think I'll settle with the High Templar as when I play any type of rpg or mmo, I like to play the Wizard
