I definitely have a prefence for fishing the Ronde from Troy to Boggan's Oasis. Part of the reason for this is that it is road accessible, and the river from Boggan's down it primarily accessed by floating it. There are other reasons for my preference, the shear number of runs on the river, so many I can't imagine that they could all be named, and they can all hold fish. There don't really seem to secret spots on the Grande Ronde, you pioneer your own water and you may find fish, sometimes alot of them.
The Vistas and the wildlife that the Grande Ronde canyon present can be amazing. There are also numerous deer and Bighorn Sheep around the Ronde, as well as a great variety of birds. On my last trip I was fishing on of my favorite runs as night was setting in and from up the canyon wall, not far away, an owl began to hoot, it had a deep, low quality to the sound and sent shivers down my spine.
On my first trip to the Boggan's area I fished a 13'3" 7wt which was fine for the size of the river, but I would have preferred a lighter rod for the diminutive size of the fish, 4-6lbs on average. In my recent trips to the Ronde I have fished either an 8110-4 Sage switch rods which fishes much smaller than an 8wt and is alot of fun on smaller rivers, or a 6126-3 Sage, really this rod can do anything.