I'm currently in Myanmar and have been staying at a meditation center (Sayadaw Tejaniya's center) for quite some time this year, so I hear a lot about the SEasia meditation scene from other meditators. Based on what I've heard... it sounds like the quality of Suan Mokh has waned since Buddhadasa died (obviously haha), but I haven't been so I can't give your

If I were you, I'd go to one of the Mahasi centers in Malaysia, Myanmar, Nepal, or Sri Lanka. You can also find Mahasi - family techniques (i.e. Chan Myaing centers in Myanmar or Chom Tong centers in Thailand). Panditarama (Myanmar), Panditarama Lumbini (Nepal), MBMC (Malaysia) are some of the most well regarded centers. Panditarama is notoriously strict (personally I don't think I could handle the schedule without good sati/samadhi momentum already).

I also highly recommend dropping by Sayadaw Tejaniya's center for a bit if you are in Myanmar. The approach is more about building wisdom/skillfulness into the practice in order to handle the practice in daily life. The teaching is reminiscent of the 'Actual Freedom Technique'-- both work with the mind/defilements more than the Mahasi technique. Tejaniya warns against having super strong samadhi without any real wisdom--- the strong samadhi can amplify neurosis/mental states and can lead to some bad psychological issues. So, yeah, the Tejaniya approach can be built into other practices to help balance things out in a good way (whether you're doing Mahasi, Pa Auk, whatever... a lot of people pass through here and it seems to augment their practice quite quite a bit). What's also nice is that you can speak veryyy openly about your life with this teacher... if you were to bring up drug experiences, the fact that you frequent dharmaoverground, etc. at these other centers, you can expect a very close minded response (the folks at Panditarama Lumbini won't be too happy for example).