My problem is not the exchange rate, but visa regulations that make me spend more and more time out of Thailand (if it wasn't for visa issues, I would spent all my time in Thailand, except summer trips to Germany). So I have been everywhere in SEAsia except Philippines, but plus Hong Kong and Taiwan, and nothing matches Pattaya.
I'm currently looking into Myanmar and Vietnam to spend more time in next year (from one-week-trips extending to month(s)). (Cambodia is too small and too poorly developed bus systems to travel around the country, and apart from Angkor Wat there is nothing to see anyway.)
Thailand has it all: gogo, massage, sauna.
Vietnam and Cambodia massage and sauna.
Myanmar massage but no sauna.