we would like to virtualize seven server all running debian etch. It's one loadbalancer using apache with mod_jk, two webserver with tomcat, one app server with tomcat, mailserver, fileserver and a databaseserver running mysql.
We want all of them on one single powerful host. The host will be put to a colocation facility. We will have only one upload and one managed switch.
Migration should be as easy as possible and the vServers have to run as stable as possible.
What would you use for virtualization? XenServer, esxi or something different.