The last two trips to WDW with all four of us, we rented points for 1-bedrooms at BWVs.
We are actually going to try to do a trip to CSR this spring because we're doing
free dining and it's what fit the budget. We're bringing an Aerobed, which we carry with us any time we get a hotel room these days, for more sleeping room. We know it will be crowded feeling, but its one trip, and we aren't planning on doing this every other year, like the OP is with the DVC points.
I just wanted to caution the OP about the space issue as a possible problem. I think OKW is a good choice for a studio, as they are bigger than the others.