Entry level rates largely depend on time of year. I've seen Siam Suites for anywhere from the mid to high-$200s to the high-$300/low-$400 range. VERY reasonable IMO, and very competitive with the MO/Pen.

I've checked a lot of rates here lately...forget the dates, but on one of my searches the best 2 rooms in the house (Pool Villa & Connie's Cottage) were all sub-$575/night. Killer.