I have an alternative solution for you:
Subscribe to the RSS feed on low-end-box: http://www.lowendbox.com/feed/
Look for deals in the range $10 -$15 a year. I have a $15 server with 25Gb space.
Install BarracudaDrive on the VPS as explained here: http://barracudadrive.com/cloud/
Select the BitTorrent plugin when installing BarracudaDrive, more info here:
http://barracudadrive.com/blog/2010/11/ ... ent-Client
Install davfs2 on your RPI:
sudo apt-get install davfs2
Create /mnt/torrents: sudo mkdir /mnt/torrents
Mount the online BarracudaDrive server (on your VPS) from your RPI as follows:
sudo mount -t davfs https://your-VPS-IP-address/fs/torrent/download/
You can now copy all torrents from your online VPS to your RPI. I usually start this job before going to bed.