Hi,
I'm probably going to upset a few people on this forum but here goes. Do NOT go to the Philippines for your training. From my personal experience their training standards are lax as is the oversight from the authorities. I don't have personal experience of the other SE Asian countries you mention but I've heard nothing that would warrant recommending them. Australia and the US by contrast have some excellent schools.
On a more general note, choosing a school by price is likely to be a false economy. You need to choose on credibility. A frozen ATPL is not a passport to employment it's just the basic qualification which allows you to be considered for a job.
Airlines are very cautious organisations and like to select their recruits from graduates of well known and well respected schools.