I wish I had better gear on this mage but it was an alt and I leveled my main priest in BC. Let me know what I can update!
Well, first off you're a gnome so you can get to 390 ENG and get a LK trinket - Noise Machine
Your set bonuses kinda suck, so personally I would not worry about them at all and just transmog your nostalgic pieces - or you can go full vanilla and rock that. Up to you. The gem gear for you is chest and legs, legs being your Frostfire tho... not too sure how nostalgic you are about your naxx gear since you got the feet 2 weeks ago. Your rings are actually really good, and look to be better
than the gem rings next patch.
Except for the fact you'll want crit for speccing fire... we have a couple fire mages around that will help you more than I can. I was going to link stuff for you like the trinket above but Wowhead's not working for me.
So here's a mage like you originally asked for. Lol. http://us.battle.net/wow/en/character/kelthuzad/Orcane/simple
GM gear is not
optimal, I just like the set bonus. And i'm too lazy to run raids for "better" in slot stuff. But check out the helm, boots, legs and rings - basically what you were asking for minus the chest. Sorry.
edit- the way it looks to be headed in 5.4, your frostfire legs will be better than the gemmed legs - so you might wanna focus on other stuff, and/or getting more T3... if you're able to. =D But that trinket for sure.
edit2- and there's a harlot called Deadoncemore that's going to complain about how fire got ruined... Disregard.