Ebutte,
Don't know what you did in DVC Calculator but for those nights (9/15-9/20) would cost 52 points for an OKW studio. At $10/pt that would be $520. A 2-bedroom vacation home (master bedroom and bath, second bedroom with 2 queen beds and bath, living room, full kitchen, and laundry room) for those nights at OKW would only be 142 points. At $10/point that would be $1,420.
I am a DVC member and considering renting points in the near future.
To learn more about DVC and its resorts, you can check out Disney's website. To learn more about renting, the DVC Rent/Trade board here has a lot of information.
Hope this helps.