What's the best method to get 5gigs of data uploaded? 

 Take a look at our FTP Proxy, its quite nice for uploading lots of files and large files.  You can find the installer for this application at the link below:

 http://developer.nirvanix.com/files/folders/reference_code__applications/entry507.aspx

Let me know if you have any questions.

Regards,
     Barry R.

 You can also use the nput bash script. If you like to.