I was making this list for my own personal use, and decided to share it. This list if geared towards people who either don't raid much or who are just starting out raiding. These are not the be all end all pieces, just something to look out for if you're picking what instances you want to focus on. If you're an uber raider who has the best of everything this list is not for you. Heck, if you're an uber raider you probably don't need help from some internet forum to choose your gear anyway so why are you even reading this?
I've sorted the gear by instance, and focused primarily on jewelry as I'm fairly set on armor at the moment. However if anyone has armor pieces they would like to have added to the list just let me know.
---Befallen: Cavern of the Afflicted---
Woven Belt of Dark Tidings - The Bonegrinder
\aITEM 293997906 510059531:Woven Belt of Dark Tidings\/a
Befallen Tome of Darkness - Random Mobs
\aITEM 2137690210 1221095274:Befallen Tome of Darkness\/a
---Befallen: Necrotic Asylum---
Necrotic Wrist Wrappings - Wilhelm Horrorbile
\aITEM 1129405889 -588595794:Necrotic Wrist Wrappings\/a
Cloak of Marr's Fist - Random Necrotic Casters
\aITEM -451884255 2085615551:Cloak of Marr's Fist\/a
Words of the Dread Exarch - Dread Exarch Mordek
\aITEM 1404480392 1404470735:Words of the Dread Exarch\/a
---Miragul's Phylactery: The Crucible---
Wand of Elemental Knowledge - The Codexicon
\aITEM -1157721601 -1495941620:Wand of Elemental Knowledge\/a
---Ravenscale Repository---
Helix - T'lon the Powermonger
\aITEM 1556512229 -158726145:Helix\/a
The Bloodied Advisor's Robes - T'Lon the Powermonger
\aITEM 412423441 783938474:The Bloodied Advisor's Robes\/a
---The Ruins of Guk: The Lower Corridors---
Band of the Ghoul Protector - Hoptor Thagglor
\aITEM 9316944 1103616905:Band of the Ghoul Protector\/a
Furious Pantaloons of the Froglok King - King Vroap Vriipp
\aITEM -542437947 1055047118:Furious Pantaloons of the Froglok King\/a
(okay so mostly I just like the name of those pants, who can resist some furious pantaloons!)
---The Ruins of Guk: Ykesha's Outer Stronghold---
Malovari's Misplaced Bauble of Banishment - Zraxth
\aITEM 997214058 106305898:Malovari's Misplaced Bauble of Banishment\/a
Gruuper's Bangle of Incineration - Gruuper Groo
\aITEM -137096903 1694766449:Gruuper's Bangle of Incineration\/a
Eye Ring of Keys - Mrogold Minosk
\aITEM 2010282562 782558563:Eye Ring of Keys\/a
Ring of the Maw - Trogoldon Greck
\aITEM 618097898 868044303:Ring of the Maw\/a
---Anchor of Bazzul---
Earring of the Void Transfer - Magus Vein'ca
\aITEM 1708160282 -996361547:Earring of the Void Transfer\/a
Bauble of Dizsho's Channeling - Di'zsho The Channeler
\aITEM 1949664387 -1884950930:Bauble of Dizsho's Channeling\/a
Wrap of the Void - Executor Zynos
\aITEM -38202423 -54839546:Wrap of the Void\/a
---Palace of Ferzhul---
Indestructible Obliterator's Shackle - Ferzhul, Maldormous Exeter
\aITEM 196938529 535272706:Indestructible Obliterator's Shackle\/a
Drape of the Void-Touched - Maldormous Exeter
\aITEM 99704869 100485346:Drape of the Void-Touched\/a
Forgotten Ring of Souls - Ferzhul
\aITEM -373528028 -489742003:Forgotten Ring of Souls\/a
---Veksar: The Sunken Theater---
Aidyl's Scaled Sash of Dragon Songs - Garudon
\aITEM 1544895902 1071313584:Aidyl's Scaled Sash of Dragon Songs\/a
---Emperor Atrebe's Laboratory: The Fabled City of Kor-sha---
Girdle of Mutagenica - Ka'El Ka'Vrish
\aITEM -1819345476 1876194028:Girdle of Mutagenica\/a
---Najena's Hollow Tower---
Drakota Fang Necklace - Magmadadin
\aITEM -643360218 -1609760535:Drakota Fang Necklace\/a
Najena's Ring of Readiness - The Reformed Magolemas
\aITEM 1742204660 -2090443436:Najena's Ring of Readiness\/a
This is far from a complete list of the decent items that can be found in instances.