Thanks for your answers. I think ISP Config 3 is too complicated for me:
- editing apache, php or mysql config files cannot be done in ISPConfig, still need terminal
- ssh, ftp or webdav can not be created with the same directory, username, password in one time
- some stuff with "The perfect server..." don't fit my need for Wordpress or don't work the good way (file upload in Wordpress get a server error, etc...)
So I will look for something more easy to manage.