You can get rid of duplicates using yahoo pipes. It's pretty simple.
First create a Newzbin saved search that gets what you want. Say for example I want standard TV posts:
Group: a.b.tv
Size: 150-450
Codec: Divx,Xvid
With the actual search I can select my shows, say I want Scrubs, House and Veroncia Mars. To get the current seasons I would search for:
"Scrubs - 6" or "House - 3" or "Veronica Mars - 3"
Save the search, run it and get the RSS feed link. Then go to Yahoo pipes.
Create a new Pipe.
Add the Sources: Fetch Feed module, paste the Newzbin URL in the url field.
Add the Operators: Unique module. Connect the Fetch Feed module to the top of the Unique module.
The module will fetch the feed and the "based on" box will fill out with options to filter by, select item:title in the drop down box. Then connect the bottom Unique module node to the Pipe Output module.
That's it, your done. Now all you have to do is save the pipe, Run the pipe, when the results are returned click Subscribe and get the RSS for the pipe.
Put that RSS into SAB.