My major sweet spot is 23k points for a 1 bedroom in Kauai.
Actually, Kauai's probably the sweet spot for a regular room if you're upgraded to RC. Those puppies go for over $700/night. Not bad for 15k points.
Hyatt treats diamonds very well. Add to it all the bonus promos & FFNs and, at least for me, I do what I can to maintain status.