Have you considered Bullet Proof/G6 server or Serv-U FTP? I have used both and I like Serv-U better and it supports SSL as well and is very configurable and version 4 has been very stable. If you don't mind the learning curve, Raiden is awesome.
Chris Chandler MCSE 2000, A+, Net+, Security Consultant -----Original Message----- 8<----snip---->8 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.351 / Virus Database: 197 - Release Date: 4/19/2002