Our guild took a while to press into Gruul's Lair, mostly because we were fairly small do to expack issues (Kara) and needed to add people. We had a mage with a really good tanking set built, who then proceeded to stop playing after the first time we tried the fight >< - so I got pressed into service with whatever stuff I could find in a week.
Here's a few key pieces I came up with:
[wowitem=32776]Crown of the Sea Witch[/wowitem] - jewelcrafted - 42 sta, 20 int, 20 spi, 23 +dmg, and 3 sockets (36 more sta or 30 sta and 10 +dmg)
[wowitem=28530]Brooch of Unquenchable Fury[/wowitem] - Moroes - 24 sta, 21 int, 26 +dmg, 15 spell hit
[wowitem=27778]Spaulders of Oblivion[/wowitem] - Murmur - 25 sta, 17 int, 29 +dmg, and two sockets (24 sta or 12 sta and 11 spell hit)
[wowitem=28232]Robe of Oblivion[/wowitem] - Murmur - 30 sta, 20 int, 40 +dmg, and 3 sockets (36 sta or 24 sta, 5 +dmg, and 8 spell hit)
[wowitem=28185]Khadgar's Kilt of Abjuration[/wowitem] - Temporus - 20 sta, 22 int, 15 spi, 36 +dmg, and 3 sockets (36 sta or 24 sta, 8 spell hit, and 5 +dmg)
[wowitem=27795]Sash of Serpentra[/wowitem] - Kalithresh - 31 sta, 21 int, 25 +dmg, 17 spell hit
[wowitem=28633]Staff of Infinite Mysteries[/wowitem] - Curator - 61 sta, 51 int, 185 +dmg, 23 spell hit
You'll also want to get the epic LW +stamina leg patch, and stam enchants/patches wherever you can fit them. Since I happened to be both a scryer and a jewelcrafter, I picked up a [wowitem=29132]Scryers Bloodgem[/wowitem] and [wowitem=24126]Living Ruby Serpent[/wowitem] for trinkets. The [wowitem=31113]Violet Badge[/wowitem] could be useful also.