A very unassuming restaurant in a strip mall near McLeod Trail and Heritage Drive. The décor has been updated and is quite cozy and authentic. Although the dishes are slightly more expensive and a little on the small side (which is why I didn't rate it a 5/5), the quality of food is excellent!
This restaurant features one of my all time favorite dishes, Larb Moo. Rather than being served as a salad as most other Thai restaurants (if you can even find it), Thai Nong Khai serves as an entrée. The flavours are very unique, a mix of lime, toasted rice, chili, lemongrass and ground pork - a Northeastern Thai specialty that's served room temperature. The curries and pad thai are also excellent.
Rather than driving all the way downtown, I would definitely recommend trying this restaurant out if you're in the south.