Basically, I'm downloading a lot of films at 480p these days due to the decreased file size.

Which group(s) do you think create the best releases of this kind.

I myself go for SANTi releases (an encoder on IPT) as they seem like the best quality for 480p releases I've seen so far. I'm after names to look out for so when said releaser hasn't encoded a film I want there are other names in my mind.