Your RAX account manager may point you in the direction of their new DevOps Rackers.
Rackspace are rolling out a new platform called CheckMate that will aid customers to deploy application stacks rather than simply just servers. Here's a great slidepack from a presentation at the Texas Linux Fest last year.
They're now contributing heavily to the Heat solution. Something you can potentially use in your private and public cloud.
Similarly, have you tried out Scalr or RightScale? Both enable you to build cross-cloud server images (sort of). Might be too late for your existing images today but if you proceed like this, you can deploy in either of your clouds using the same tooling.
No technical answer I'm afraid but thanks for listening!!