I've got a 500s Dreamdox.
Paid around 4k for it and around 1.5k for the extra wireless router it needs to run on.
500ish baht every 3 months for "maintenance".
The box has no card and I had my old True dish that we use.
Got most of the channels (PPV included).
No major problems in the 2 years that I have had it.
If you have a Thai spouse/mate, then a quick Google search will point you in the right direction of a local company that will hook you up in a day or 2.