I was reading up a little on changes with tier pieces. From what EJ is stating +15 spirit is better than +10 Stats for non arcane mages. This does not take into account that mages are made of paper and perhaps the 10 stamina is better than a small DPS increase.
See the post here:
http://elitistjerks.com/f75/t42476-optimal_sets_item_discussion/p29/The math (not mine):
"Yes i calculated the same. BUT its only right for non-Arkan Mages! If you are Arkan you can choose Mind Mastery. 5/5 gives you 15% Spelldmg from Int. That means that the +10 int from powerful stats will give you 1,5 spelldmg, wich are 1,8345 DPS
Short calculation:
0.2061% Crit are 9.462051 Critpoints
0.2287% Crit are 10.499617 Critpoints
100 crit = +81.2 DPS
9.462051 Critpoints = +7.6832 DPS
10.499617 Critpoints = +8.5259 DPS
+10 Powerful Stats = +7.6832 DPS
+15 Major Spirit = +8.5259 DPS
7.6832 DPS (Powerful Stats) + 1.8345 DPS (Mind Mastery 5/5 +10 Int DPS) = +9.5177 DPS for Arkan Mages"
Fire Mages should chose with 2xT9 +15 Spirit, but Arkan mages should keep their +10 stats. (8.5259 DPS vs 9.5177 DPS).
