What are your favorite Xenon Enhancement mods?

So, What are your favorite Xenon Enhancement mods? That is, mods that make the xenon stronger, more coherent, etc. Which ones do you use? Which did you try out but you don't use anymore? What do you think of them? What would you recommend? How much do you think they change the state of things for the xenon? Have you noticed that your favorites don't play nicely with some other mods?

Enlighten me with your experience :)