I worked at NIST International School in Bangkok about 10 years ago, however, I still have colleagues there who tell me it remains one of the best schools in Asia.
NIST is a co-educational, day school that uses the IB curriculum and is accredited by WASC, NEASC and the IB, obviously. The school has something like 180 teachers and 1100 students with a very diverse background. Roughly 30% Thai, 30% Asians other than Thai and 30% mix of western expatriate children. The teaching staff is around 40 different nationalities. NIST is an equal opportunity employer.
The package is very good, they do distinguish between local and overseas hire. You will work hard, but they look after you well, and central Bangkok is actually a great pace to live.