I'm happy to say that I am now represented by Kelli Christiansen of Bibliobibuli Professional Editorial Services, who recently made the jump from the editorial side of the publishing industry to representing clients. I met her last year while she was representing a publisher, and while that didn't pan out, she remained interested and excited about the project that proposed early on. She'll continue to work with myself and my wife on it in the near future. She has an excellent background in the types of books that I'd like to be researching and writing, and it felt like an immediate fit.
We've got a couple of proposals in the fire right now, both non-fiction, which will hopefully come to something in the reasonably near future.
In the meantime, time to write!