We are thinking of migrating from Plesk to cPanel w/ CloudLinux for new servers which will prevent one user from using all of the resources of a server.
This also allows us to sell packages with different CPU/IO/connection limits instead of just disk space.
If you are currently on the EAST server and would like to try out the new system, please email plesk at lvcs dot net or use the helpdesk to request migration.
This also allows us to offer a wider range of PHP versions due to the way users are isolated.
SSH access is standard on this server for Gold and Titanium plans.