Sunfire

It does not affect Arcane Shot. Some patches ago, Arcane Shot got changed so that it receives a bonus from ranged attack power rather than spell power.

This isn't one of those enchants that you put on Battle Mage's Baton or The Bringer of Death. Neither is Mongoose for Ced's Carver. When you get a very, very good staff or main hand weapon (I'm talking about http://www.wowhead.com/?item=29988 or http://www.wowhead.com/?item=30910), to settle on +40 Spell Damage when you could increase raid DPS (even slightly) with this or the Soulfrost Enchant seems silly. This is the be-all, end-all weapon enchant for Fire or Arcane Mages and Destruction Warlocks, and just for that fact you will get it if you have the money.

to be honest, there are a million and one enchants that are far more beneficial to hunters, regardless. Try any enchant with agility, intellect (if your into that kinda thing) and even strength. Considering the mat requirement for this... i would highly recommend getting major agility on 2h (which is actually much MUCH cheaper than this) which grants 35 agility. if you dual wield, theres always the +15 agility enchants from pre tbc, and if your a marksman hunter (who benefit from intellect) then you could take a major intellect enchant instead. all of these are far better than +spell damage en