Another thought is, get some spell hit trinkets... from best to worst (non-25 man raid instance drops):
Scryer's Bloodgem (Revered with Scryers):
Scryer's Bloodgem - Items - World of Warcraft
Arcanist's Stone (Heroic Durn, off the Epoch Hunter):
Arcanist's Stone - Items - World of Warcraft
Starkiller's Bauble (quest in Netherstorm):
Starkiller's Bauble - Items - World of Warcraft
Terokkar Tablet of Vim (quest in Terokkar):
Terokkar Tablet of Vim - Items - World of Warcraft
The great thing about having these is, the only time you need the really high spell hit rating is for bosses (bosses have 17% base chance to resist your spell, lvl 72 mobs only have a 6% chance). This way, you can gem up with more of an emphasis on +dmg and only equip these trinkets when you hit a boss. If you have, for instance, the top two trinkets there, you get an extra 57 spell hit, or a 4.5% increased chance to hit. This allowed me to go back and replace my Veiled Noble Topaz with Runed Living Ruby and Potent Noble Topaz.