Flame Leviathan: An excellent hunter trinket, especially if you are lacking in the hit department, or have been wanting to switch out another item with hit on it. I wouldn’t suggest spending all your DKP for it, but definitely something you should eventually pick up.
Razorscale: Not counting hard mode, these bracers are the only shot you will get at an improvement in Ulduar 10. If they are better than what you are currently wearing, drop your DKP, suck up to your loot council, or hope your dice are lucky to obtain these ASAP.
XT-002 Deconstructor: Another decent placeholder until you can pick up your T8, but not something that you should be overly upset about if you are outbid or outrolled.
Ignis the Furnace Master: The worst (I hate saying worst, as this weapon is not terrible, just not as good as the others) two-hander in the instance. This item is not worth making your guild take on Ignis for, as he has a rather sorry loot table in general.
Kologarn: Only pick up this cloak if you are in desperate need of the hit, or if your guild cannot and will not be killing Hodir anytime in the near future. The cloak Hodir drops is a far better choice.
Iron Council: As has been said of items before this, this item should only be picked up if you need the hit. Otherwise, your best bet will be to wait for your T8 headpiece.
Auriaya: Another 'meh' piece. Good enough to pick up as a placeholder, but not good enough to keep over T8 gloves.
Freya: A red socket, decent socket bonus, and overall good stats make these the gloves that will be ideal for you to pick up. Do not be fooled by other glove drops that you may be tempted to put in their place.
Hodir: Yay! Tier Legs! Pick these up, as they are the best you are going to get in Normal 10-man Ulduar. With their two sockets, they easily surpass any other legs, not to mention they may allow you to finally get the two or four set bonus.
Thorim: One belt is available, making this a no-brainer. Check your belt, and if this is even remotely better, pick it up, as you have no other real options in Ulduar till you attempt Hard mode or 25-man.
General Vezax: While this neck is the only available neck in normal Ulduar, it is only a slight upgrade for those who have obtained the neck from the quest line involving the killing of Malygos for his heart. Pass and wait till the price goes down if you have this neckpiece, if you don't, pick this item up.
Yogg-Saron: These legs may drop off a boss deep in the instance, but that doesn't make them better than your tier leggings. Unless you really, really need the hit, or just have really terrible luck with drops, pass on these.
Trash Loot: An excellent pair of boots, and once again, your only chance at improvement inside of Ulduar 10 sans Hard Mode loot. Make sure to put these on your list of things to get as soon as they drop.