Currenty Im running Serv-U because it was easy to setup and it allowed me to easily make it secure by setting up Implicit SSL. Now I would like to find something else, a different FTP server program.

No, use GuildFTPd for FTP, we use it here at my office, haven't had any security leaks, very easy to maintain and keep setup, and, there are even a few very nice addons for it, specifically for ...