Cross platform SFTP with X.509 Certificate authentication

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Greetings wise ones, I am trying to find an SFTP server\client program
and as yet have not had any luck. My SFTP server will be running on
Windows 2003 Server and the clients will run on windows 2000 and
greater as well as Unix workstations (Solaris for the most part). I
need to meet the following requirements.

1) Support digital certificate authentication
2) Support unattended command line file transfers using digital
certificate authentication with domain IDs.
5) Support RSA Keys
6) Per user SFTP starting directory control
7) Supports RSA/SecureID

I have found a few that are close but none as yet that do the trick
cross platform. Any help on this issue is greatly appreciated.

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