there are so many, check nexus for top mods/downloads for the DLC. Some good ones are.. Climates of Tamriel, Frostfall, Realistic Needs and Diseases, Wet and Cold, SMIM, Realistic Lighting Overhaul, Pure waters and SKYRE
Due to the amount of updates going to be pushed out by RLO i would lead more towards this one because it is going to have similar effects like ELNFX did. I have used both and i tend to enjoy RLO more because it is more realistic, if you want more of a fantasy lighting go for ELNFX
Personally i like to use both haha. I only use first person when im directly talking to npcs and when im just walking around. On the other hand I use third person whenever i am in combat because i can see what is happening around me more clearly.