move SQL Server 2008 R2 database to new server

Hi,
We have SQL Server 2008 R2 on Windows Server 2003. There are 5 SQL instances with 1 database in each instance.

We now have new Windows Server 2012 with SQL Server 2008 R2. We are looking to migrate all the database and logins from old server to new one.

Is following the best way of achieving this ? Please share if there are other better ways.

1. Detach Databases from old server.
2. Install SQL Instances on new server (keep instance name same as in old server)
3. Attach database to the SQL instance.
4. I will use then use this guide to transfer logins/password http://support.microsoft.com/kb/918992/en-gb

Any help would be much appreciated, thank you.