Any high damage build will work perfect with WW but there is 1 item combo that will make you a killing machine . 2 Molag Kena , 5 Briarheart , 5 hunding's Rage . Proccing Kena with light attacks and Briarheart will proc almost instantly due to high critical chance . It will take 2 or 3 howls and GG .
People may flame me here but I will say it . Sorcerer . With Critical Surge active , you are impossible to kill . Second best probably would be NB because of Grim Focus + Siphoning Attacks . You should think about what you gonna do while NOT in WW form too . Stamina Sorcerer falls a little behind other stamina classes I can say .
Little tip : Be careful while attacking DKs . They can reflect howls . When they activate reflect , just spam light attacks . You will do insane damage no matter what . And choose Berserker morph for WW .
WW does very good in fights that last less than 30 seconds . You can do at least 35k DPS easily . You can use the same items but removing 1 kena and using 1 Bloodspawn instead probably will do better .
You can also do this : No monster set . 5 Hunding's Rage , 5 Briarheart , 2 Agility Weapons . Since you can upgrade those weapons you will get more Stamina bonus from 2 piece . My friend did 35k DPS with 410-420 champion points with his NB in sewers to a boss . He was solo so he could have done much better in a proper party . So it goes like this : NB = more damage , Sorcerer = More survivability . I would suggest a NB since you gonna need proper damage while not in WW form .
Another tip for PvE : Use Rearming Trap before going WW .