Sacrificing for 4set bonus

[Tempor]

Currently I'm using http://www.wowhead.com/?item=45893 and http://www.wowhead.com/?item=45265#contained-in-object, I'm wondering if dropping these two items for T8 shoulders http://www.wowhead.com/?item=45400and head piece http://www.wowhead.com/?item=45398 would be worth it for the 4set bonus (I have the gloves and legs already, and my guild is only a 10 man raiding guild)

I'm pretty certain that dropping these items for the 4 set bonus is worth it but i need confirmation ??? (Combat Rogue)

[Voij]

Worth it.