Back off Barbas is a must have. I tried UFO for awhile but didn't care for it. Let's see what else: Quality World Map, Oblivious Horses (so Shadowmere doesn't charge at every enemy and get himself killed) and SkyUI naturally, the unofficial patches. Mostly a pretty vanilla Skyrim. I tried several others from time to time but went back to the basics. Maybe a nudie mod, but I'm not telling.