Also if I were to purchase SERVU what version would I need?
I am unsure since I dont know how HC interacts with it. Does it go through the API and create a username inside of servu (in which case you could use the Professional) or does it link the account to the windows account(In which case I would choose corporate)
http://www.serv-u.com/versions.asp
Here are some other windows based ftp servers with 128 bit encryption I have com across through a link from a competitor of hc.
http://www.g6ftpserver.com
http://inicom.net (makers of flashfxp)
http://raidenftpd.com (doesnt look too professional)