If you want to experiment, try some other form of roast. Might be a bit tougher but still good eating.
I have yet to do a PR but I've done 3 or 4 chuck roasts or whatever (I can't remember what they were called) We like rare here so I usually took them out around 118 or 120 and they turned out great.
Here's a sample:
Nope... sorry. It says my ftp login isn't working to upload the picture. Yet I am logged into the forum. Sorry, it was great BBQ porn.