The most powerful sorceror build you can ever make is the "Exalted Sorceress" build which is Sorcerer 38/Paladin 1/Monk 1. Just crazy powerful. You can google it.
Some other one's that I've played with that are really fun is Monk 17/Blackguard 4/ Sorcerer 19.
Human, Lawful Evil
Str 16 (20)
Dex 10
Con 12
Wis 8
Int 12
Cha 16 (24)
You get Divine Might and Divine Shield to improve your armor class and damage, great saves from the Blackguard, and use the Sorcerer spells as buffs for your kickass monk.
A good spellsword build is Sorcerer 26/Paladin 4/Champion of Torm 10
Human, Lawful Good
Str 16
Dex 8
Con 14
Int 12
Wis 8
Cha 16 (26)
Once again using Divine Shield and Divine Might, great saves from Paladin. He'll be better at spells than at swords but still nothing to sneeze at melee-wise.
Use the Epic Character Search Engine to find builds to play around with or get ideas.
http://home.comcast....wk/buildsearch/