best i can tell you is that telek drops the amount of mana lost when hit, so you wont lose your whole mana pool so fast
i would put 1 into frozen orb for cc and use blizz for the bosses/elites
blizz/fb sorcs are pretty good, just don't be brave. s/e if you catch any hint of doll going to meph, they WILL one shot you with no issue
you can use the moat trick on meph, id suggest doing nm meph to get some good practice in. you can still find a lot of good stuff, just not the top tier ggs