Hello! I've taken the time to create an optimal Moonkin gear list. I've also made one for my personal gearing path, as some items are so small of an upgrade over other items I have (Example [Blade of Tarasque] is only 40 dps below the mace, and that is assuming I replace another piece of gear at the same time.

I've come to the conclusion that the best set up is t9.258 4 piece with helm, chest, shoulders, and gloves with 258 pants of Anub. Sadly, unless you get all 4 pieces of 258 tier gear, you'll do more dps with 2 piece t9 (Head/Chest) and 2 piece t8 (Shoulders/Gloves).

This list is the current optimal gear set:

Head: [Malfurion's Cover of Triumph]
Neck: [Wail of the Val'kyr]
Shoulder: [Malfurion's Mantle of Triumph]
Cloak: [Jaina's Radiance]
Chest: [Malfurion's Vestments of Triumph]
Wrist: [Bindings of Dark Essence]
Hand: [Malfurion's Gloves of Triumph]
Waist: [Cord of Biting Cold]
Legs: [Legwraps of the Awakening]
Feet: [Boots of the Unrelenting Storm]
Ring 1: [Firestorm Ring]
Ring 2: [Band of Deplorable Violence]
Trinket 1: [Reign of the Unliving]
Trinket 2: [Reign of the Unliving]
Main Hand: [Misery's End]
Off Hand: [Chalice of Searing Light]
Idol: [Idol of Lunar Fury]

This upcoming list is basically the optimal set you can have, if you aren't capable of getting 4 pieces of 258 tier but can atleast get 2 pieces of 245 tier and have old tier 8 in the bags.

Head: [Malfurion's Cover of Triumph]
Neck: [Wail of the Val'kyr]
Shoulder: [Conqueror's Nightsong Mantle]
Cloak: [Jaina's Radiance]
Chest: [Malfurion's Vestments of Triumph]
Wrist: [Bindings of Dark Essence]
Hand: [Conqueror's Nightsong Gloves]
Waist: [Cord of Biting Cold]
Legs: [Legwraps of the Awakening]
Feet: [Boots of the Unrelenting Storm]
Ring 1: [Ring of the Darkmender]
Ring 2: [Band of Deplorable Violence]
Trinket 1: [Reign of the Unliving]
Trinket 2: [Reign of the Unliving]
Main Hand: [Misery's End]
Off Hand: [Chalice of Searing Light]
Idol: [Idol of Lunar Fury]

That is the optimal dps you're going to have, without getting 4 full 258 tier pieces. I will likely sub out those bracers, and that weapon, for Bejeweled Wizard's Bracers and Blade of Tarasque as it's probably one of the least dps increasing upgrades for me. If I can get Nebula's Band I'll use it over Band of Deplorable Violence since it's only a few less dps.

(NOTE TO NIT PICKERS, NOT DONE, WILL EDIT AGAIN.)