Re: Starter build
My two suggestions would be Charged Boltress or Fishymancer.
With a Charged Boltress you can decimate everything very easily up until NM act 5.
Once you get to NM you can farm Mephisto for the basic gear needed to compete in Hell. NM Meph can drop some pretty good uniques.
the best inexpensive caster items are actually runewords
spirit: tal + thul + ort + amn, 4 socket swords/shields: +2 skills, fast cast, life, mana, resists, etc.
insight: ral + tir + tal + sol, 4 socket polearms: lots of damage, meditation (mana regen) aura, put this on an act 2
merc
lore: ort + sol, 2 socket helms: +1 skills, mana, resists
stealth: tal + eth, 2 socket armor: run/walk, mana regen, hit recovery, resists
rhyme: shael + eth, 2 socket shield: magic find, resists, blocking, cannot be frozen
with some rune finding luck from countess or in general slaying thousands of monsters (places like flayer jungle and cow level are nice for this) you can have all of these runewords assembled by late normal or early nightmare, giving you +3 skills, nice mana regen, nice resists and lots of life and mana
Fishymancer can complete hell with little to no gear at all. The only issue he needs to consentrate on is getting his resists up to avoid those pesky mobs that corpse explosion on death ..and gloams.
So after a ladder reset i would make a sorc and use her to gear up a more fun character.