I've tried most races,but always seem to go back to human races. I usually,play as myself in the elder scrolls.I roleplay what i would do if i lived in a world like that.
I've played imperials,nords,and bretons. I prefer bretons because ( to me ) they are associated to the british,and the french also,they are a mix. So i usually go with them. I also like nords,but they were too tall for my liking. With the new custom body options,i will probably choose nord first "if i can change their height". I've always liked the look of darkelves,but never really stuck with it.
Anyway to sum it up: Breton and nord will be my choice for skyrim
*Edit* I voted breton.