Just chiming in to say you are not going to be able to book BLT for that time on a consistent basis. We go at that time every other year and I always book my BWV standard view as soon as the 11 month window opens. Only once was I able to waitlist into BLT for that time ( a 1 bedroom) and I got on the waitlist at 9 am on the very day my 7 month window opened. (I love BWV and prefer to stay there most of the time, but I wanted to give BLT a try at least once).
Plan on waitlisting most years and staying in a lake view room. Standard and MK view rooms will be booked before the 7 month window opens. Studios and 2 bedrooms will be much more difficult to get than a 1 bedroom.
If you can't book more than 7 months in advance or if you don't mind staying at your home resort of SSR if BLT isn't available, SSR will be a good choice for you.
If you will be disappointed if you can't book BLT, then buy BLT. BLT dues are less than SSR and trust me, the extra up front cost to get BLT points will not seem like such a good deal if you are unhappy when you can't stay there.
Good luck with your decision.