Bob,
As I'm sure someone will be happy to point out, I don't own an SAS car. But like you, I'm interested and I've been lurking here for a few years watching the story unfold. I remain optimistic and enthusiastic about the product.
They definitely have a unique, well engineered, well built product by all accounts. However, the stories about production time lines that continually slip are also well documented, so you'll definitely want to read through the archives and talk to some of the active members who are still waiting.
As a third party observer, watching threads and checking the SAS website, there does not seem to be a clear queue that you get in to, at least not that I can discern and only a handful of cars have been delivered to date.
Just one third party observation, but I think setting your expectations at 24+ months would be more consistent with the current people in the build queue...
-Jeff