Thank you guys! I appreciate it!
Some info:
It would be nice to get full control over DNS entries. That means, I need to be able to edit MX, A, NS records and orders, SOA entries, etc.
It would be nice, because now I have to edit individual dns settings for most of the domains.
I will be able to check the migration and test it in closed environment (cloning the existing openvz container and do the migrating).
István