Quote Originally Posted by 'Taliesin',index.php?page=Thread&postID=179470#pos t179470
Personally, if I had 3 mages, then I'd spec one of each, as there are benefits for each one.
this was my initial thoughts as well. Unfortunately I could never get the total DPS of 1fire+1frost+1arcane anywhere near 3 of any identical spec. This was a long time ago when I was wearing full frost savage (what like 1300 SP?) on all 3 mages and may be worth revisiting now.
The variety of DPS also means that a particular mob immune to just fire, or frost, won't really slow you down or require a special rotation.
Out of curiosity does such a mob exist inside of an instance/raid? I lead on my druid and I can't think of a time I've seen immune on his screen.