I have 60 emblems, I find myself often dipping under the hit cap and as a result have to replace some gems for +hit gems, so Belt of Omission (http://www.wowhead.com/item=50996) seems like a good option, but everything else says to go for Circle of Ossus (http://www.wowhead.com/item=50997).
My stats are:
+292 Hit
+627 Haste
2904 Spellpower
Here's my armory, if you need it.
http://www.wowarmory.com/character-s...ond&cn=Faelash
Cheers.