We own at AKV and love staying at Kidani. We bought direct and they were selling AKV and BLT at the time we bought. We liked the theming of AKV better and still prefer that resort over BLT, although being able to walk to MK is really cool. I did not know about the resale market at the time we purchased, and I don't think resales were quite as good of a deal back then anyway. I don't think I would buy direct now, given the wide difference in price between
DVC and the resale market.
You'll obviously need a two bedroom for several years. OKW has the largest rooms, and I think they now have the sleeper chair as well as sleeper sofa in the living room. BLT and AKV also have the sleeper chair. BLT and AKV 2BR have the third full bathroom, which would be a big benefit for your family. Look at the
points charts closely to see how many points you will need to stay in the accommodation type that you desire during the times of year you are most likely to travel. If you see yourself only going every 2 years, buy half as many points as you would need.
If you are looking at resale, there is a wide range of pricing. Given that you will need 2BR's, you could probably find a desperate seller with a large contract who would be willing to take a low bid, as the larger contracts take longer to unload. On the other hand, for your own purposes, you may want to buy two or three small contracts with the same UY so that you can "downsize" in the future, if desired. With a large single contract comes a large, single MF bill, which only get larger every year.
Probably the best deals out there are OKW, SSR and BWV. OKW and BWV contract run through 2042 and SSR through 2054. AKV has come down considerably over the past 6 months and the contract runs through 2057. Even BLT seems to be dropping quite a bit. If you are going resale, try to find a loaded contract (or contracts) which come with current year and possibly even banked points from last year.
Choosing a home resort really depends on your personal preferences. Although we love AKV, it is generally easy to get a 2BR savanna view room most times of the year; but the value and concierge rooms tend to go to AKV owners. Similarly, BLT Magic Kingdom and standard view are very difficult to get if you do not own there. If you don't care where you stay, SSR may be the best deal given the current resale prices and the length of the contract.
Good luck with your decision!