Have you tried the Priceline Asia board? I don't know if this is still available, but the JW Marriott, which is an awesome resort, was coming up for less than US$40 a night. It's a five star in the Thalang zone. Here's the Asia Pline discussion board.
http://pub143.ezboard.com/fpriceline...scussionsfrm15
Just read your requirements again ... this might be too secluded for you. It's pretty much away from everything else.
[This message has been edited by letiole (edited 02-20-2003).]