Blue's greaves takes the seat for worst itemized pally piece for 2.4 imo... 100 badge chest closely following.. the 2.3 60 badge feet and the jungle stompers (or if ur spiffy/dumb and went BSing over engineering or JCing u can use the T5 quality craftable boots) are much better options to go with.
On the topic of the neck pieces:
I used the CE rep one when i was gearing up for Kara (trying to reach uncrush etc) as my one and only neck piece **note that was also pre 2.4 and therfore pre SSO rep**
Once I replaced/upgraded my CE rep on to the Barbed Choker from Maiden I switch back and forth btwn that one and the SSO (im scryer btw) one constantly. They are both really nice in certain situations:
Maiden (or CE rep one... essentially same itemization but diff Ilvl)
-Bosses that crush
-Making sure ur def is over 490
-Trash mobs that hit really hard
-Large AoE packs (Jan'alai's adds/Hyjal trash)
-well u can realistically use this thing whenever
SSO (Scryer proc is a bit more versatile)
-I use it when I tank Nalorakk's bear form... extra stam helps a lot where avoidance doesn't do too much for u against him not to mention juggling threat back and forth is a lot harder if ur attacks arent landing as much.
-Single target pulls where threat is a potential issue (L2 not use salv as much).
-25man trash packs where ur tanking only a couple targets that dont hit particularly fast
-I pretty much use this thing whenever I know I'm going to be mana starved from not taking enough dmg... so basically almost every heroic pull that doesnt consist of 4+ mobs and the whole first 1/2 of Kara (I think I switch it out around Nightbane/Illhoofish
So my point being is that the CE rep one is overall the more versatile of the 2, but the SSO neck has some great utility in some major situations
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FearsWarden of <One Shot> Draenor -- 70 HU Tankadin
http://www.wowarmory.com/character-sheet.xml?r=Draenor&n=Fearswarden