I know everyone wants the the 6.0, I just don't know if 40hp is worth the time spent in my opinion... If it was a strait drop in and not trying to figure out the computer stuff. We'll just have to do a head to head comparison.
In my case the 5.3 needed to be replaced and I had a 6.0 sitting around needing a home so it made sense. The bigger transmission is more of the selling point than even the motor swap.