Hi MGulledge,
If your having trouble selecting a registry, you can contact a service called Elixir. Elixir is a matching service that takes your practice and matches you to the appropriate registry. Its kind of like a dating service between practices and registries.
For more information, you can email info@amazingcharts.elixirmd.com. Please note that it takes about 6 weeks to get up and running with a registry, so I would recommend contacting them ASAP.
I hope that helps.