Edit: As for build, I would make birthsign Atronach, but I always do that no matter what my character is. So this is my take on the rather popular 'one-handed weapon with magic' spellsword/battlemage archetype. Hey all, I am attempting to make a 'Spellsword' build.
It is unlocked for purchase after completing the first boss fight with the Aether Horror. Other reasons for my thoughts are the battlemage's focus on conjuration of allied beings and the spellsword's restoration, and finally the alchemy for the former and illusion for the latter, alchemy meaning strong poison on weapons for high last resort damage while illusion seams pretty usefull in combat during Oblivion. The spellsword is a more standard version of the Paladin build, with a bit more flexibility on what kind of spells to build on and what kind of armor to go for. Khajiit and Bosmer are also balanced, but sort of weak overall, since they skew more toward Speed and Agility. In the long run, they all work out more or less the same. Spellswords are relatively easy to play in the long run, but they can be sort of tough to build.