Many times of the year, you would be able to get in just fine at the 7 month window. However, there are certain times of the year that the 11 month window becomes very important. Some DVC guides, though not all, will gloss over that point and lead you to believe that it's never a problem. However, our very own CarolAnnK here ended up purchasing an additional BWV resale just because she wasn't able to get into the BWV using her OKW points two years in a row in December. So, I agree with what Rich said above, Buy where you wanna stay the most. That may even become more important 20 years down the road as more members join the club.