I'm pretty sure that the rack rates are available on the DVC website or on the WDW site.
We're also planning a trip with extended family next year, and have quoted them rack rates if they all decide that they want to stay on Friday and or Saturday nights (we hgave enough points to do Sun - Thurs only, as we'll need 2 - 2 BRs). I've told my husband's family, that if they all agree that they want to add on a night or two, that will be approx. the max (since those are 2001 rates), and I will work on gettting discounts from tehre (either DVC, AP, or whatever I can find).
--Kathy