1. I think 65 mastery is better than 50 haste although I think the difference is marginal. (I also use 50 haste xD)
2. I'd change boot enchant to 35 mastery / run speed. You can never count out the dps value of run speed. Even if we do have blink et al. top move around.
3. If you can, get a load of caster guildies and throw yourself in LFR, hope for trinket from spine to drop and get yourself it!
Looks alright, would replace the crit on bracers with Intellect, gloves mastery, but not a huge increase. Not sure why you are using 5 piece when your chest and helm are 384, could replace one of those with a valor one. Lavawalker on boots isn't exceptionally necessary, hit might be more suitable. Bottled wishes isn't that great whatsoever but maybe you used it for spine or something.
Edit - Buy the BoE crafted bracers also. They are a very large intellect increase.
DMC:V Is a bit outdated, but i guess thats your "luck"
I would say that you should think about your feet enchant aswell, and maybe get a run speed bonus, (Mastery+speed ench)
But the rest of it looks really good 7/10
Havnt been on here since DS came out thourght i would put my mage in here and see how im going with the rest of you guys Mage is Cállipygous US-Frostmorune Vision sorry cant post links more of a forum reader instead of poster. hope you like my transmog :P
Note: Im in the middle of reroling proffessions to tailoring/chanting theres why they are all so low