Overall the best build I ever did for Diablo 2 was a Meteorb sorceress which used Meteor and Frozen Orb and just decimated virtually everything in the game (except for some very rare Fire + Cold Immunes in Act IV Hell difficulty). I think I got her up to level 93 or something and used her as my primary magic find character to accumulate top level gear for all my other builds. As such, she ran through Mephisto, Pindleskin, Diablo, Baal, etc, with ease even on Hell.
Here’s a great guide.
Don’t be too terribly worried about not having the ideal gear mentioned at the bottom of the guide, as some of it is quite rare, and some (like the higher level runewords) are just not going to happen unless you invest a ton of time into the multiplayer game. The build will still be fine even without the best equipment. Just make sure you’re using gear that complements your build (further increases the skills you’re using, pumps up resistances and stat points, etc).