If you like Nam Tok you should know that there is an entire range of foods that fall into a similar category as that dish. it is called Isaan (or Esaan) food and it is named after the northeastern part of Thailand where the dishes originate.

It tends to be cheap, available almost anywhere, and the only dangerous thing is you have to be careful about how much spice they put on it because as I am sure you know, they spice the hell outta their food over here.

you are in for a culinary treat once you get over here :)