in almost all of the frost mage specs i see improved frostbolt is always taken. i'm wondering if the 5 points to reduce by 1/2 a second of casting time is really worth it. when i'm soloing i usually use it as an opener for the chill effect to give me time to get off arcane missiles before it reaches me to be followed by frost nova, step away, and either frostbolt to cone of cold or arcane missiles to finish it off.
Here's the build I'm looking to go to: Mage Build . If I take improved frostbolt, what should I lose? the 3 piercing ice and 2 arctic winds? That will result in a lower damage for all frost spells, including blizzard and cone of cold which get used just as frequently. Should I just become more dependent on frostbolt and not use arcane missiles?
Thanks