Just to give you something to work with, Studio accommodations at Old Key West would "cost" 68 points for the period you listed. OKW tends to be the cheapest
DVC property, but it has the largest guest rooms and many think it's one of the nicest resorts in the program.
68 points will run you about $680 as a rental.
The accommodations will be far better than a moderate resort guest room. More square footage. Balcony. In-room kitchenette. Two queen beds.
However, be aware that the maximum occupancy for a Studio or 1 Bedroom DVC accommodations is 4 adults plus 1 child under age 3. If all five members of your party are over age 3, you would need to jump up to a DVC 2 Bedroom suite. The accommodations are even better yet than a Studio (king bed plus two queens, full kitchen, in-room washer-dryer, whirlpool tub, dining area, larger balcony which accommodates a table + 4 chairs, etc.) But the 2B will run you 182 points for the dates you listed.
Note that DVC rooms cost quite a bit more on Friday and Saturday nights, both of which are included in the dates you posted. If you were to switch your stay so that the nights all fell between Sunday and Thursday at the end of August, four nights in a Studio would run you 40 points, while the 2B would be 108 pts.
Good luck.