Checked Jhazrun's armory yesterday. He had yellow haste gems and green haste/spirit gems, gear reforged to haste. If I remember right, his stats were like ~22,2% haste total, ~13% crit and ~17% mastery. Talented Twist of Fate; Smite and Holy Fire glyphs.
I checked his armory today and he has nothing equipped. Perhaps I witnessed the born of new metagame? :D
2 the topic: Personally I like heavy haste setup, although I cant tell whether haste >, =, < mastery/crit (too lazy to do maths (my maths is quite bad ;D)), might be worth trying. Most interesting "combination" of stats could be Haste+Crit. Smite-DA machine! MP management might be issue tho. I feel like I should test it.