I would absolutely recommend TEFLPlus for TEFL training if you are interested in teaching English in Thailand. The course is extremely well planned out and provides you with all of the essential skills needed to become an English teacher. The staff are very knowledgeable and professional and the practice component of the course gives you the experience needed to be comfortable in any teaching environment.
The small class sizes are an added bonus as they allow a lot of personalized instruction to allow you to focus on the areas you want. Located in Patong, you can relax on the amazing beaches on the weekends and also experience some of the very interesting night life that Thailand is famous for! Given the reasonable price of this course, I think this is an excellent choice if you are interested in becoming an English teacher in one of the world's most beautiful and friendly countries.