Best FTP server software?

[LA_MERC_th33_r00k]

I know some of y'all are running FTP servers and I want to know what/who you think is best and why. I am getting ready to implement a FTP server for offsite backup of customer data and I need it fairly easy set up for the client and secure.
Client side stuff is easy for the most part any way. :loser1
Security is the Matrix.:matrix1

[LA_MERC_T4rg3T]

Ws_ftp server

[LA_MERC_th33_r00k]

Thanks T4rg3T.

[LA_MERC_T4rg3T]

Ws ftp has worked out well for pgp. That's why I use it