Bosmer for the most part. I have dabbled with an altmer atronach mage, and a breton mage, but I usually come back to the Bosmer. Plus, I just finished a 2 day stretch of improving the tree house mod by Rabina just so I could have a nice home for a woodsy type character (like my Bosmer).
Plus, I once heard someone make a good point about being a Bosmer, "Being small also means you are a smaller target". :celebration:
I like being a sneaky, unarmored mystic archer that uses absorb health when in melee range, and supplements his attacks with illusion and homemade poisons. I am using a mod that makes acrobatics also an unarmored skill that gives you a shield effect based on your acrobatics skill (luckily there is no glow on me like with a shield spell though). He is also a good armorer and alchemist.