clearly rogues are op, duh
mage raid spec is arcane, really? bluh. i liked FIYAH!
It is still better to have 1 mage as Frost fire bolt spec for improved scorch, the crit bonus to all casters more than makes up for dps drop from being fire spec.
Here are some easy upgrades Data for your gear, rep items are key for fast upgrades, rep is easiest way to get fast upgrades, join 3 heroic instances that drop stuff you need and head off and start doing quests or dailys that give rep for factions you need. Cooking quest gives Kirin Tor rep which is great.
Ancestral Sinew Wristguards - Item - World of Warcraft - Wyrmrest Revered
You get the bracers on your way getting these from Wyrmrest Exalted, ranked number 2 in the game for pretty much every caster dps class and spec in the game.
Sandals of Crimson Fury - Item - World of Warcraft
Weapon is very easy to get, and is better then a lot of epics. With the rep you have you could pretty much pick any heroic and toss on the kirin Tor tabard and be able to get it.
Flameheart Spell Scalpel - Item - World of Warcraft Kirin Tor Revered
When you get some more hit you can change over to the kirin tor cloak if you haven't gotten something better.
Shroud of Dedicated Research - Item - World of Warcraft Kirin Tor honored
Pants from heroic Halls of Lightning are great until you get a drops in Naxx 25 on pants better in Naxx 10 are the T7 pants.
Woven Bracae Leggings - Item - World of Warcraft
Offhand is obvious from badges, I picked it up after getting the badge belt.
Ward of the Violet Citadel - Item - World of Warcraft 25 heroic badges.
3rd best wand in the game drops from Heroic Azjol-Nerub, which is great because even a half assed pug group can clear the place in 15-20 minutes.
Rod of the Fallen Monarch - Item - World of Warcraft
This chest also drops in there, it is very similar to what you have right now though.
Egg Sac Robes - Item - World of Warcraft
This trinket is worth doing Heroic VH everyday until you get it, expect to roll against other casters when it does drop, pre raiding everyone is going for hit cap and this trinket helps a lot.
Mark of the War Prisoner - Item - World of Warcraft
I get a idea of what is good gear for arcane from
http://www.maxdps.com/mage/fire.php it isn't that accurate for arcane only because fire specs stack crit over haste.