Considering you'll never get the full value of haste in pvp due to not having 100% uptime on a target due to range issues or being CCed, haste loses a lot of its value because it contributes significantly to run regen. You'll often times have runes not regenning because you can't use them. Due to this, haste will never overtake STR in PvP. Unless you're playing at low ratings where people just let you smash their faces in. In which case, balancing haste/crit/mastery is the best route. (See this link for more details:
http://www.destinysoftworks.com/2013...ity-in-54.html)