If you're just looking at this summer, no way I'd buy more points. I think you have the idea you can sell them latter without a loss and have the use in between, I doubt that will be the case for SSR bought retail but you never know. I'd just do cash or else get transferred points into your account for a one time trip.
I considered the transfer option, also thought about a different TS in HH I might be able to rent for less than the DVC HH points. I am just trying to figure out the best way to make a vacation work and appreciate any and all help.
I too think I'd go with the point rental. If you could find a member that is renting HHI points and would book the ressie for you, you wouldn't have to wait until the 7-month mark.
Buying at $83, using 1+ yrs worth of points and selling at $78-80 seems like a pretty good deal. But don't forget you need to pay maintenance, which will add $4 per point for at least one year. You would also have to sell the contract yourself to avoid broker commissions. If you have to use a broker to sell the contract, you will pay 12-15% on the transaction. That's another $13-17 out of your pocket, bringing your proceeds on the sale down into the $66-70 range.
It's also unknown how the resale market will react to this DVC promotion. If prices bounce back to the $90 neighborhood, then points will probably continue to sell at the prices you see in that database. But, if another highly-discounted price should follow, resale prices will surely begin to slide in response.