OP,
It seems overwhelming at first... but really, once you 'get' it, it isn't.
There are TWO factors to take into consideration... Your personal preferences (golf, plush unit, lots of family activities pools, location close to Parks, etc...)
And, another huge factor is availibility with RCI for the dates that you want.
The nicer/plusher resorts will be harder to get into.
Other larger family friendly resorts will probably have units available for you.
With RCI, if you want to request a resort that does not show availability, your friend with the RCI membership week can get on a waiting list by putting in a 'search' for that resort for that time frame. (the catch is that you must pre-pay that reservation fee now, not when something comes available)
We are RCI members, so if you wanted to send me a PM with your preferences for type of resort, unit size needed, and date range, I can PM you back and tell you what resorts are showing available for immediate reservation right now!!!
Personally, we decided that we wanted the big family friendly resort with a lot of amenities, pools, etc... didn't want to spend time waiting for something to become available thru a 'search'. So we recently booked a 2 bedroom at Orange Lake for our next trip!