I, too looked into buying SSR at first, then purchased BWV instead, and am now adding on at VWL. I can only talk from personal experience (my reasons for deciding not to purchase SSR).
Looking at the size of the resorts:
VWL 136 accomodations
BCV 208
BWV 383
OKW 531
SSR 860+
Makes me believe that the smaller resorts will become more difficult to get into after the 7 month window. I think if there are ever ANY rooms available to rent...the chances of those rooms being SSR rather than VWL or BCV are pretty good. Therefore, owners of other resorts will not have much of a problem booking SSR 5 or 6 months out...but, SSR owners might have a difficult time booking VWL or BCV seven months out.
We considered BCV and BWV because we liked the location, and knew we would want to stay near Epcot most of the time, and although we were tempted by SAB, we felt that we could experience that benefit of BCV when we stayed there...not because we owned there. We cannot use SAB even if we OWN at BCV if we choose to stay at BWV. But, as a BWV owner, we could stay at BCV (when we can get a ressie) and use SAB. That benefit is tied to occupants, not owners.
However, BWV had a little bit of a "different" perk. BWV is the only resort to offer 2 different "tiers" of points...standard view rooms and boardwalk/preferred view rooms, with different point values assigned to the different views. Thanks to these boards, we were informed that the standard view rooms (often with as much as a 30% in points required to stay) go VERY quickly, and are frequently not available to people who book after the seven month window. Due to the scarcity of these rooms (I heard they are less than 10% of the available rooms at BWV), the standard view points tier is mainly an "owners only" perk. With a 6 or 7 nite stay, this difference could add a night (or sometimes 2) to your stay...that is a big difference. These standard view rooms are cheaper than the rooms at SSR. Requiring fewer points to stay makes BWV standard views the bargain of the Epcot area, and IMHO makes the points more valuable.
Anyway...I don't mean to offend anyone with my opinions, and I hope I have not done so. The bottom line is this...if I REALLY liked SSR more than any other resort, I probably would've bought there. Or, if SSR had been a "tiny" resort rather than a large one...I might have bought there. We chose to buy into a specific resort for the "advantages" that ownership in that resort could give us. At appx $4.25 per point, per year...maintenance fees (not initial costs) are the big expenditure...and in that, all the resorts are roughly similar, so I would decide what features are important to you, and go from there. You can make yourself absolutely crazy if you try to "balance" the scales...there's just too much info to weigh in on...just pick what is important to...whether that is location, length of contract, amenities, price, or one of the MANY others....and, put your money where it makes you feel good (now THAT statement could be easily misinterpreted!! Oh my...I am blushing

) After all, it's just money...but, life is short, and you only get one go at it...buy where you will be HAPPY!!!!
Beca