Best practice to migrate all the domains from one server?

Hello,

I have 150 domains in one server wth Plesk 11.0 and Debian 6 and now it is time to migrate the domains to another server with Debian 8 and Plesk 12.5.

I don´t have a slave DNS server so all these domains are under their owns DNS.

I am thinking what is the best practice to migrate all the domains at the same time. This is my conclusion:

I create a new server with different IP.
Then migrate all the domains.
Then I switch off the old server.
Then change the IP of the new server to...

Best practice to migrate all the domains from one server?