So let's say I get a wild hair tonight and decide to create a sorceress. You think all cold is the way to go, or maybe mostly cold for Normal but save a few points for lightning/fire when she moves up to Nightmare?
You'll have to save a point for Static Field, at least, and it's good to have the secondary skills (Hell is unplayable without them - and there are quite a few monsters immune to both cold and fire...grrrr!), but a cold sorceress is an amazing Normal/Nightmare killing machine. I like Ice Blast/Blizzard, some people prefer Glacial Spike/Frozen Orb. I actually had to use a short sword to help me kill things early on, but once you get Ice Blast (a truly nasty spell that turns those little Democrats into ice cubes so they can't be Revived) at level 6, you're off to the races!