by Segen » Mon Jun 15, 2015 5:07 pm
OP,
For 40 man raids the 2 specs to go are either deep frost (winter's chill) or AP/frost. Ideally you want to have at LEAST one deep frost mage for the +10% FB critical for the other mages. Typically the better geared mages run the AP build and the newbies get forced to provide winter's chill. However if you have the option to choose you should see what better fits your playstyle.
I am currently AP frost, but I recently respec'd from deep frost. Personally I prefer to be AP for raids. You lose out on having +10% critical FB without other mages around, and you lose Ice barrier which is very nice to have to prevent spell pushback and give the healers a break. In return, your FBs will consistently hit harder and most importantly you mana efficiency will be twice as greater than going through the deep frost route. The AP spec leaves u very vulnerable especially when soloing and in pvp while going 31 frost gives you more room to do other things outside of raids.
Either spec you do, avoid picking up shatter, as you need these talent points to max out +100% critical damage, piercing ice, and frost channeling. My spec is exactly what the second poster linked, except I prefer 2 pts in imp. Dampen magic instead of imp countrrspell.