LogFAQs > #958458549

Tal Thul Ort Amn and Ral Tir Tal Sol are what you want early on. The former goes in a 4 soc sword (Broad or Crystal preferably) to give you Spirit, one of the best caster weapons (it can also go in a 4 soc shield, but that won't be available until Hell when you can find a Monarch). The latter goes in a 4 soc polearm (e.g. Partisan) to give Insight, a merc weapon with the Meditation aura, which replenishes Mana.

Ort Sol in a helm and Tal Eth in an armor are decent early on too.

You can see the rest here (click the links at the bottom): http://classic.battle.net/diablo2exp/items/runewords.shtml