Sonar's plugs haven't always been proprietary. If you've been a Sonar user for years, you might consider reinstalling an old version long enough to copy the plugs to a new location before you uninstall it.

I recently reinstalled Sonar 6 32&64 bit for exactly that reason. It still runs in compatibility mode, and its very stable.

Another thing I like about Sonar 6 is that its menu structure is a LOT like Real Band's, so there's a lot less of the dreaded "2 different DAWs" confusion.