File sharing solutions

I’m looking for a solution on file sharing through our companys subsidiary. we have no connection to them, the’re standalone.
We have had an ftp server on a try but it was through microsofts ftp/iis but i found it to be to simple and unsecure, we had several hacking attempt on it and there was no way to block the ip.

what’s the most popular in this area now? something over https with login/password etc?
Hamachi? VPN? G-mail? or some web hotel? Haven’t checked with our web site suplier if they have anything…

Im only looking for simple data sharing no remote control in any way.
I’ve like the solution to be kind of “good looking” with some preview on files/pictures which you don’t get on an ftp solution.

Any sugestion?
Regard.