Agree with Demoraj. You can pick anything and it can work. If you want to min/max, pick something that is unique like Breton (magic resist and magic absorb), High Elf (extra magicka and 1.08 height scale), Orc (double damage / half received). If you want to RolePlay, pick any race that you like the look of, or you like their daily power or racial.
Edit: Ah man. Haha, ninja'd by Golgo, I pretty much said almost the exact same thing he did, but then he also said more/better stuff than me