Imperial, I'm boring and prefer to play as a regular human in any fantasy RPG. They're the easiest to relate to. They're also the least stereotyped, in my opinion. Elves are aloof and mystical. Orcs are brutal and direct. Humans can be anything from "ultimate evil" to "ultimate good", and the Imperials are the most average of all the humans in Oblivion.
If I want some of that Khajiit sneaking or Argonian underwater breathing, I'll just make spells for it. I never even use the Imperial racial ability, so I'm not bound by that.
Hell, my Imperial character's class is disgustingly varied to an absurd degree:
I wear heavy armour, use bows, or one-handed swords. I never use shields. I tend to sneak around, a lot.
My seven skills, as I can remember was: Acrobatics, Armourer, Athletics, Blade, Heavy Armour, Marksman, Restoration and Sneaking.