I have read through the entire thread and can not believe that noone has been talking about using Sickbeard and Couch Potato!!!
I use SANnzb to do the downloading but I also have it linked up to the sickbeard and couchpotato apps, by doing this all the downloading and management is done automatically without me ever having to do anything.
If you have not done already, I seriously recommend looking into these.
Sickbeard
This is ued to manage your tv shows. You add the shows that you are interested in and it will automatically download the new episodes as soon as they are available without you needing to do anything. You can configure it to only download a specific quality etc.
Once its downloaded it will unpack, move to the appropriate series folder and rename the file so that it is all organized correctly (This is good if you used things like boxee box to watch the content).
You can also get it to reorganize any existing files that you have already downloaded previously.
This works like a charm, as soon as a new show is available it is downloaded and I get sent an email to say it is done.
Couch Potato.
This is similar to sick beard but works for movies.
Basically you create a wish list of movies that you want, these can be thing that are out now are are scheduled to come out in the future. Like before, you also specify the quality (HD, SD, Cam etc).
As soon as the file with the match quality is out, it sets it off to download in SABnzb and once its downloaded moves it to your films folder all named correctly as required.