Fiesta Henderson is definately the closest to you (about 7 mils from LLV), but you will probably not like their game selection (standard spread is 2/4 and 3/6LHE with a $40 max white chip NL game on weekends).
Sunset is a little further, and has 3/6/9 and 4/8 usually.
GVR, as others have said, is your best bet. Though it is about 10-12 or so miles from LLV, it will have the most games and the widest selection, with standard 1/2NL and 2/5NL running pretty much 24/7. 2/4 and 4/8 is also common spread.
As always, check out the main site and the forums at
www.allvegaspoker.com for additional info on these rooms.