Well for a PvM Sorc meteor can be very good but you would need a cold spell to at least slow down enemy for meteor frozen orb is the best to do this job before i got all my accounts banned i had a cold/fire sorc maxed meteor, fire mastery, frozen orb, cold mastery, 1 point in static i was casting on cow frozen orb once static a few time while waiting for meteor then meteor and u got some hamburger for a result. If you really want it to be fire/lightning can be very challenging indeed for hc i would suggest u at least get 1 point in frost nova and use hydra/charged bolt but you need good item for charged bolt to make it worth it and u can cast it between each hydra also it doesnt cost much mana the dmg will never be huge on your charged bolt it cant become big but the important is the ammount of bolt skill level +2 thats where u get the dmg and who know in next patch maybe there a skill that will give bonus to charged bolt
i had a charged bolt blizzard sorc but the blizzard wasnt hitting enought target yet the bolt were decent and it make it easier to do the low level if u dont get rush