I don't know about you but I like to be a bit neurotic about having different gear sets based on a variety of factors, including:

• The level of the target I'm dpsing
• Raid/Group composition
• What spec I'm playing
• Duration/mechanics of the fight

The addition of new pieces of gear constantly has me alt-tabbing to remember what numbers I am shooting for to re-do my various gear sets.  I'm adding this for my own reference, and for anyone else who thinks it might be helpful.

Remember, for every 26.23 Spell Hit points you have, you get 1% Spell Hit.

Possible Modifiers:

• Heroic Presence - 1%:  Draeni Racial, Draeni must be in your group (not raid-wide)
• Improved Faerie Fire OR Misery - 3%: Do NOT stack, Passive, Must have either a Moonkin Druid or a Shadow Priest spec'd in to these talens, Raid-wide (based on you dps-ing the same target which has the debuff)
• Your own talents - Varies:  Mages 3% for ALL Spells w/ Elemental Precision, Mages 3% for Arcane Spells only w/ Arcane Focus, etc

Also, if you find yourself short for whatever reason, instead of having to re-gem, you can always consider a temporary solution of using [Snapper Extreme].