I would check out
www.selahaudio.com. They have a section under the manufacturers here.
I plan on doing a Peridot kit in the near future, but it seems that you might be able to swing that setup, prebuilt. The matching center is not horriblely priced, assemebled, either. The Peridot and matching center would run $4745. There are no prices listed for a matching surround for the Peridot, however. Ask Rick over there what a couple pair would run, and maybe you could swing it, all up.
To cut cost, you could go further down the line and get the 35F and 35C with a couple pairs of Hiddenite for the 4 rear channels. That would run you less than $3K, together. You could spend extra to get them done in precisely the exotic finish you like best. You would have 45 days to make sure they worked for you, as well.
Just a thought.
Regardless what you go with, good luck!