Ok so I have an arcane mage right now but want to change to fire usign the TTW spec, my concern is that right now I have only around 41% crit and I've read that the minimum for this spec to work is 45%, now changing my gems might help with this but then another concern appears and is that when changing my arcane gems to the ones required with fire (crit replaces spell power in some cases) I will lose some spell power so the question here is (I haven't find this exact detail in the guides I've read) how much spell power is necessary for fire spec? In that way I can better choose which gems to equip to be able to hit the caps necessary.