Kenneth, you still haven't responded as to whether you need sites migrated or not.
We're ex-Plesk Gold Partners and could certainly perform the conversion, though...
a) if at all possible I'd personally rather rebuild a server
b) because of the limited future of updates for RHL9, I'd also want to switch to a more current OS; DA works with RHEL 3, WBEL 3, and CentOS, which are all more recent RH-based operating systems with years of support ahead of them.
I wouldn't be able to quote until I knew about the site migration issue.
Jeff