Well if I had alot of honor or conquests points stocked up and planned on playing wow in 4.3 I would spend so as to save as much time as possible farming honor when the new season comes out.

-Convert 6,000 honor --> 4,000 Justice points at the 375 -->250 ratio.
-But two sets of Head and shoulder enchants that are right for your class, I linked the spell caster dps:
Head: Arcanum of Vicious Intellect - Item - World of Warcraft (1 at 1,000 honor = 2,000 honor)
Shoulder: Greater Inscription of Vicious Intellect - Item - World of Warcraft (2 at 2,000 honor = 4,000 honor)
You'll need two sets one is for the Ruthless Season 11 (i390), and the other is for the Cataclysmic (i403). Since you'll be busy farming out honor for the new 390 gear, it is just less honor farming you'll need.

Make sure and complete the TB quests, wintergrasp quests right before the new season, also buy your enchants and gems now.

This is sure to save you some time if you weren't already doing these things previously.