I really need to get back in the habit of doing updates.
Anyway: S4 gear for PvE for mages doesn't seem to really be that great an idea. Last I checked in Rawr, the S4 pieces all tended to lose out to gear acquirable in early T5 if not earlier.
The neck is a different case. The Guardian's Pendant of Subjugation is a very nice piece. When gemmed with one of the new epic haste tems, it comes out superior to Loop of Cursed Bones from Zul'jin, which is a pretty nice neck piece. (When I finish updating the item list, I'll be able to show the difference better.)