Sorry GA, I think I hit send too quick!
There are a few others, but you may have to double check to make sure they are still in business. Some outfitters seem to stay in business a long time, and others seem to sell their areas after being in business for only a few years.
I have seen several posts where people have booked with an outfitter, and their area changed hands before their hunt. I guess it could be hit or miss if that were to happen, depending on the new outfitters knowledge of the area, their ability to retain the previous owners guides, etc.
I did read an article a while back where the hunter contacted his outfitter, only to find out the business had been sold and the new owner knew nothing about the hunter being booked. Fortunately, the outfitter still honored the agreement.
Definitely read the fine print before you sign! Ask for a lot of references, both successful and unsuccessful. I think repeat clients really say a lot about the quality of the service too.
I only spoke with a few from my list and from yours, but you might want to add the following to your list to research:
Scoop Lake
Collingwood Brothers
Simpson Stone Sheep
Cassiar
Fire Mountain
Golden Bear
Full Curl Stone
Gunson Guides and Outfitters
Yukon Stone
Deulling Stone
Besa River Outfitters