"Shepherd Pass...the monster.....Have not tackled that one yet"
It can be a grinder, Ken, but it is a beautiful route and offers by far the most direct approach to The Divide and Upper Kern Basin. You would need to be in good shape to do it, but not super shape. The toughest part is the first day and a half. After that, the terrain is easy hiking and, as Dave T said, "crazy beautiful". If you decide you want to do this route, PM me and I will give you the beta on how to do Shepherd Pass. There are a lot of ways to skin a cat....
"The pictures that I have seen of Bighorn Plateau is pretty amazing. Kind of like a high desert in a way."
Bighorn Plateau itself is not something I would go out of my way to visit, but its position vis a vis The Great Western Divide and The Whitney Crest offer views you will remember the rest of your life. There are none better, IMO. It is not a place to hang out, however, if there is any chance of thunder storms.
Also, for timing purposes, there are 2 full moons in August: Thursday, August 2; Friday, August 31. If you can be up there for one of those, it will blow your mind. Guaranteed.