Well, there'll be a lot of guys here willing to fly with that qualification for less than USD1000 a month down here.
But yes, Travira is mostly an EXCELLENT from what I hear operationally. They're a member of a conglomerate... I compete with them and they're a good company!
Main base is in Halim Airport (WIIH/WIHH)...
But there's a couple more upcoming Caravan operators that might be worth a look into, 2 are based in Jakarta... 1 is using expats...
PK-KAR