I would stay with what you have unless there have been some serious issues with the seller -- and even then, you would face consequences if you backed out now.
First of all, let's look at where you are right now. You have a contract with full points purchased at a fair price, which is halfway through the purchasing process. You have made a deposit, presumably of about $1000 or more, which you will lose if you back out now. You should be closed and making reservations in another couple of weeks.
Yes, it might be possible to buy SSR for less than $66. But that would be offset by the loss of your deposit, and then you'd face the whole uncertainty struggle for another 8 weeks or so.
I would not be focusing on the fact that one or two other buyers got a lower price. I can't tell you how many posters we've seen here over the years who shot themselves in the foot trying to squeeze every last penny out of some deal.
I would be focusing on the many years of use of your contract and the value that would bring to your family. A purchase like this is for the longterm value it brings to your family, not for the momentary "love of the deal."
We just signed a 150 point contract for SSR on 02/17. We are waiting for ROFR. We paid $66 a point for this contract and wanted to ask if you all think this is too much to pay for this contract? It came with all of 2010, 2011 & 2012 points. We pay closing and MF. Please let me know because I see so many contracts that are going for less than $66 a point. This is our first contract and we are thrilled to being going home soon!
Thanks so much for making me feel better. I was looking at the list of contracts on the ROFR list and just got myself alittle flipped out! We have been thinking about purchasing an SSR contract for 3 years now and have finally taken the plunge! I have been so excited I can hardly stand it. Waiting for ROFR is the worst! We should hear something by next week! 
