How your current gear will translate into the new spell power mechanic? I am sure you are interested too. You Melee guys don't really need to worry about how spell power will change your gear.
If you have a choice between taking +Damage gear or +Healing gear in the current game right now, which would be a better choice for taking with you into Wrath of the Lich King leveling? Let's make liberal use of Wowhead, shall we? let's first check out some of the most easily accessible epic armor in The Burning Crusade right now, Season 2. How easy it is is debatable, but it's pretty easy overall. You technically don't need to group with anybody besides the forced-raids in Battlegrounds, you don't need to talk to anybody, you don't even need to really kill anybody (though you should, AFKing for the lose) to get this armor.
Let's look at Shaman armor first. I'm only going to list the especially important stats for this discussion, not the small potatoes Stamina/Intellect stuff. On the Merciless Gladiator's Mail Armor, which is the Elemental set, we see 25 spell critical strike rating, the 8 mana regen per 5 seconds, and 37 +Damage/Healing. On the Merciless Gladiator's Ringmail Armor, which is the Resto set, we see 26 spell critical strike rating, 7 mana regen per 5 seconds, and 70 +Healing(24 +Damage).
Shaman are in a good spot because both Elemental and Restoration tend to lean heavily toward Crit. You can argue that it isn't necessarily the best stat allocation for a Resto (and you might be right) but still, they use it, it's nice, it's dandy, it won't hurt you if you have it. Overall, there isn't a massive stat gap between these two pieces of armor, except that one obviously has more +Damage than the other. That one is for Elemental, and the other for Resto.
Let's look at those same pieces of armor in Wrath of the Lich King. Merciless Gladiator's Mail Armor, again the Elemental set, has 25 critical strike rating, 8 mana regen per 5 seconds, and 37 spell power. Merciless Gladiator's Ringmail Armor has 26 spell critical strike rating, 7 mana regen per 5 seconds, and... 37 spell power. Elemental has 1 more MP5 than the Resto set, and the Resto set has 1 more crit rating than the Elemental set. The only substantial difference in this case is set bonuses if you plan to run around in your 4-piece for awhile. Elemental has the 50% change to avoid pushback while casting Lightning Bolt which will be better for soloing than a slightly shorter cooldown on Grounding Totem. Then again, they did just change the pushback mechanic. Maybe in this case, it doesn't really matter at all.
The choice is yours. In this case, it isn't very substantial. If PvP gear is what you're after, the differences are going to be minor, because the basic stats are a lot more simplified. You won't get much (if any) Spirit or Spell Hit, so you basically just need to look at the crit and spell power. On the PvP gear, at least on Season 2, the gap is almost nonexistent.
The issues we run into in the Shaman PvP gear comparison is the fact that Restoration and Elemental share more stats than some other class/spec combinations. And the whole PvP gear uses fewer stats applicable to PvE thing, of course.
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