Vers all the way, and spirit on weapon. Multistrike has to have extremely high value for it to be worth focusing on in pvp with it only being 50% as effective as it is in pve.
For a guide, just google, "MW PvP Guide 6.1 Nayoko", with the quotations, first link.
Then look at the Community > BGs > Filtre by Spec > Tick MW, boom. Now you can look at their gears, talents, and question their choices.