If you have points left over, you can dump them into Glacial Spike for general blizzard damage boost or Mastery to kill immunes faster. For my build, I maxed Frozen Orb, Blizzard, Ice Bolt, Ice Blast, lots of points into mastery (I think at least to -150%), then add your 1pt wonders (static/telekinesis/teleport/frozen armor). You will not do as much damage as pure blizzard build above, but you will have frozen orb and the combination of weaker blizzard and max power frozen orb is pretty decent. I have been experimenting with a hybrid of both and I think it might be the sweet spot. Ice Blast + Blizzard can carry an 8-player game (or do ubers with the sunder charm) and takes some getting used to, plus you have a few points left over to put into telekinesis/es (I suggest making Memory in a +3 ES staff and only spending points on Telekinesis). If all you play is single-player, it will do just fine. To me, Frozen Orb is more fun and works great vs lots of weaker enemies, but its not strong enough for 3+ player game.

Classic diablo 2 blizzard vs orb