atm, you still can equip at least 3 leather items, to keep your crit within 5X after buffed.
is depends on whether you going for agi retadin or str retadin
agi ret = at least 3 piece of agi items, neck,ring,back. (at least 5500AP (if i'm not mistaken)unbuff, before you go into agi ret.)
str ret = all +str item, except trinket, icc rings will still go for agi(is still the best)
when come to 277 ilv, can go for str

my armory
http://tw.wowarmory.com/character-sheet.xm...%87%95%E5%A9%B7