Hope that this Sack of Awesome drops for you in 25-man gunship. Sure, there's lots of other pieces that are great, like Deathbringer's Will (from Saurfang-25) and Toskk's tribute wristguards (also from Saurfang-25). You can try and get the Unidentifiable Organ from 10-man Gunship too. There's plenty of decent rings and cloaks in both 10 and 25 man, though don't go all nuts on them; loot lists are still probably pretty raw. Heck, go forth and get the Quel'Delar questline so you can go grab Lightborn Spire, which is a fine tanking weapon if you don't have Twin's Pact.
But if you can get Ikfirus' sack of wonder, you should be very happy. It's good for bears, it's good for cats, it's good for anyone. Okay, maybe it's not the best for cats - but it's still going to be damn good, and should at least tide you over until you get your 4pT10.
Good luck with Icecrown!