Lotus of Siam is phenomenal!! It's located in a strange strip mall (the first time I brought my parents, they said they thought I was taking them to a seedy strip club!), but once inside, it looks and feels like your average casual thai restaurant. Be sure to make reservations - it can be an extremely long wait without one.
Absolutely everything I have tried on this menu is good. In addition to the more typical dishes, they have a lot of really good catfish entrees - my favorite is the catfish salad, which has a delicious charred and limey taste. They also have some phenomenal soft shell crab dishes! Every single soup is good, especially the tom kha gai (I recommend ordering it very mild if you don't like spice!).
Lotus is pretty out-of-the-way from where I live, but we make the trip there routinely - it is so worth it. If possible, go with a big group so that you can try a big variety of dishes.