Justin Jarrett Wapit Ridge Outfitters is a good choice.
He is a stand up guy and runs a good camp with good guides and horses.
Had a very enjoyable wilderness hunt with him
Yellowstone Outfitters is excellent - great remote camp - I've been twice with them
Trispoke Outfitters is also incredible - got two bulls with my son two years ago and saw more bulls than I've ever seen on a hunt. More likely to have some open spots, as well.
Check with Pat Ginder at At-ease Hunting too. He guides a lot of units that take more points than that around the Casper area, but I've hunted with him twice and he's an awesome guy and runs a good operation.