I agree with Chad's recommendation of putting them outside. I know I like semps for their coloring and rosette shape and when there's not enough bright lite, the leaves tend to elongate and the rosette shape is affected. Most semps need the sun exposure to get their coloring while some color up in the winter.
I suspect the conditions in Las Vegas can be brutal with high temps, dry air, intense sun. Putting semps outside may require a spot with morning sun and afternoon shade and infrequent but thorough waterings. Most important is good drainage in the soil for semps.
As to best types...I think any semp that you can keep alive, healthy and prolific is the best type. Jaime, buy a few and experiment to see what works for you...and Enjoy!
