I have restart-itis and have made about 20 characters or so now... played every race except Khajiit and Bosmer. Everyone must be asking "but how can you sneak and be an archer!?" Well, I do that with High Elves, Orcs, and Bretons. I have become partial to Breton for their magic resistance and daily power, High Elf because of their extra height, means I don't spend as much time walking places, and Orc because of their super daily power.
If this is for RolePlaying purposes, it's because Nord seems like a good race to be the Dragonborn. Live in Skyrim, be a Nord, do the Main Quest, slay Alduin. The Nord 50% Frost resist is good for warrior-type characters too. I just see the Nords as a little bit more racist than the other races (Thalmor aside), and I don't much like that.