I tell people this time and time again when asked this question.

IMHO the ideal panel would be the reliability of Ensim with the features of cPanel. Ensim IMHO is a very strong control panel but lacks in logical organization. cPanel provides great organization (the logic is easy to follow and find this or that) and is loaded with features, but lacks proper functionality.

My only other suggestion is some type of 'sub user'. This is basically like an account where you (as the admin) can grant access to certain areas or domains of a control panel to a sub user. This way you could allow for someone to create a db for their site, but not be able to delete a db for another.