I on the other hand maxed the skills in this order:
Blizzard
Glacial Spike
Fireball
Meteor
1 pt into CM and FM when they became available.
Also with Fireball/Meteor i alternated between both for about 10 lvls and then maxed Fireball completly.
When i had Blizzard and GS maxed some Cold immune started appearing but just a few boss monsters. With Merc and the fire damage i had those died easily. Otherwise there was no problem.
I maxed cold skill tree first mainly because of freezing effects of GS which is still viable throughout normal and nightmare.
moderator note: lets remain civil about threadstarting. people might have different reason to do so and seriously it does not hurt, right?
yuqing, if you think a thread/post THAT serious, hit the report button, thx.