I think Boatwrights and Yee Ha Bob is a good choice.
We did both Boatwrights (canceling Garden Grill because we were just tired and wanted to go back to our resort) and 'Ohana the last week of September.
I did love 'Ohana, but it did take a good chunk of our evening with transportation (4 hours from leaving Epcot until back at our resort) and waiting for our table, not to mention taking the time to try to eat all that yummy food. We were there during MK fireworks which made it more special, so we didn't really see much of the entertainment... but it was a guy singing when we were there and he wasn't bad.
The Prime rib at Boatwrights was pretty good. It is more of your standard restaurant, but it was a quicker meal... and the quiet atmosphere was a nice change of pace with so many other entertaining meals earlier in the week.
We ended up at the pools until the kids were tired because they were having so much fun that we never made it to see YeeHa Bob, but I've heard so many good things about his show.
While it's fun to do all the popular restaurants, it's also good to slow down the pace for an evening and enjoy. POR is a nice resort to relax at.