I guess it depends on what suits you , the frost tree is very good if you want to control mobs or fire for burning mobs but i only know about the frost and find it fast and safe to level with.
I went the first 3 points into frostbite and then 2 into improved frostbolt which gives you a decent amount of control over mobs or in other words you start attacking with frostbolts and the mob usually dies before it gets to you.
Next is 3 points into ice shards then 2 more into improved frostbolt.
Next is 1 point in icy veins and then its a choice and as i use blizzard a lot i usually go for the improved blizzard so i put 3 points into it and the last 1 into improved frostbolt.
Shatter is a must have so 3 points there then 2 in piercing ice.
I know it looks as if i am picking odd and random talents but my thoughts were to get the talents i wanted first then filling out to get to the next level of talents , as you can see i go as much for the defensive as i do damage talents and the talent i am aiming for is ice barrier .
I guess some may like arctic reach at lower levels but to me at lower levels it is not the best talent to have , i found i would rather have the blizzard or anything else that does damage as i find it rare that i am at maximum distance anyway , i know it may make a difference at higher levels but hey this is my levelling thoughts.