Why would you use streams?
External harddrives are pretty cheap nowadays. It'll get you a long way.
I tend to prefer torrents too. There aren't any region restrictions and you get immense freedom with the files you download. There's no DRM nonsense you get on other digital media stores (such as iTunes or Netflix).
Heck, there have been many cases where I've bought something on iTunes or else where and then downloaded it via torrent for the better files. Plus, since it's all on a local hard drive, you can use them if your internet ever bombs for a few days.