Have you looked at smaller resales and could you pay that cash ?
Maybe your spouse would find that agreeable & it gives your family the opportunity to do some DVC'ing without commiting to buying more points/spending more money at the get go.
With banking you'd have double amount of pts EOY, with both banking&borrowing you'd have triple amount of pt every 3rd year.
If you know that your family will not consistently plan a trip at more then 7 months in advance you may even want to consider small VB resale contract, even though VB's MFs are highest, just to get your foot in the door at lowest possible price per point (
recently saw some VB resales around $50 per pt ). imho, I'd take the time to run the numbers for
SSR because there have been some great resale prices there recently, it's onsite at WDW, 2054 expiration, THVs have 3 bedrooms & sleep 9 for same pts per night as 2 bedroom villa and 2009 MFs are in $4.7something per point range.
If you start small you can always build on it if you find DVC is the right fit for your spouse, you & your family....add-on contracts through Disney do not have any closing costs and can be purchased for as little as 25 points when paying cash or a minimum of 50 points if you'd want Disney's financing.