We went through the same process last year. We only became truly interested in
DVC when they announced BLT (we had looked for years but knew that the location of the CR and walking to MK were just too important to us).
We thought about just buying in at SSR to save money, as it would be about $5000 cheaper than BLT. We even bought a small 50 point contract at VWL, our 2nd choice resort, thinking we'd start there and add on slowly.
Well, that didn't happen. Once I was a member, I really wanted to own BLT and added on within a week of closing. I then owned 130 BLT and 50 VWL. The good things was that because I was already a member when I did the 130 BLT points, I paid less for them then I would have had a been a new member.
Then I started trying to plan out my 2010 vacation and realized that having two different resorts with the amounts I had did not allow me to book my whole trip at BLT (without borrowing) so I sold the VWL and repurchased another 50 points at BLT direct from Disney.
After all was said and done, I figured I now had the resort I love and in the long run, I spent very little extra to get it. Even if I figure my DVC lasts me only 10 years (and it will last much longer than that!), I spent what amounts to an extra $500/yr.
For us, it was worth spending $18,000 to get a resort we loved than spending $13,000 to get someplace we did not.
It really comes down to how important where you stay is for YOU. For my family, it is the #1 priority. For others, if they are on Disney property somewhere, they are happy. If you try to book at 7 months and can't get BLT, how will you feel? If there is going to be any disappointment, then I say go with your first choice.
However, if you think you would be okay with SSR, then look in to that but I would certainly investigate the resale avenue.
But, in case you did not know, you can use a Disney Visa when buying direct and they will give you 6 months, 0% interest up to (I believe) $10,000. This helped us buy our 2nd contract sooner rather than later.
Good luck!