Secure FTP Client

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Hi List,

I am looking for a Secure-FTP client for Windows which I can use to connect to a Secure-FTP server which is an AIX 
machine running Open-SSH

I know there are lots of FREE tools out there, but my company prefers 
to pay for a commercial product "for security reasons"

Just wanted to get an idea of the tools that you have already used

Our requirement would be one which is command-line so that we can write 
batch files to automate file downloads

I had a look at WS_FTP and CuteFTP but these do not suit our requirements

Thanks to all
Ronish