We usually go to Lotus of Siam - in the same seedy center.  Don't let the outside fool you.  Both places offer great Thai food.  I was pleasantly surprised by the quality of food at Komol.  Everything was great - we started with the coconut soup.  We also had the spring rolls.  Great appetizers.  Main courses we selected was a seafood curry dish and the basil, chicken fried rice.  Both dishes were really good.  When in Vegas - a place to go.