I think any of the ones you are looking at are good outfits.. I've looked at all of outfitters in the Yukon, NWT, and BC for Mountain Caribou. The way information travels over the internet these days, with outfitter reviews, etc. bad outfitters will not stay in business very long. If you haven't looked at outfitter reviews, do a search and there are a couple of sites that have them. You pay a couple of bucks to get them, but they are good info. If you go on the bowsite.com site the outfitter reviews are free.
Just keep in mind that the photos you see on the websites are the best of the best that are taken for the most part. You may find a 65" to 70" bull, but despite what you see on the TV shows and the websites, those bulls are hard to find. All of the outfits in the Yukon have produced bulls of that caliber. It's pretty much a matter of getting lucky to find a bull that large. I'd suggest taking the first bull you see that you like whether it's a 50" bull or a 60" bull. It's more about the experience anyway than the size of the bull, but listen to your guide.. If he says shoot or don't shoot, follow his advice.
I hunted moose in Northern B.C. a few years back along the Yukon Border. When I was driving home I was stopped for road construction. I had the antlers in the back of my truck......nice Canadian bull that scored 188" (53" wide). He was an old bull on the downhill slide. The guy in the truck behind me came up to see my bull while we were waiting. He and 3 friends were on their way back from a moose hunt in the Yukon, but he didn't mention which outfitter they went with. They had a tough time finding moose. Out of the 4, they killed one bull and it was a lot smaller than the one I killed. They did kill a wolf though. That's hunting. He said they had a great time and the guides worked hard and he'd go back in a second, but they just didn't get into any big bulls. I just wanted to share that story to put things in perspective.... Not all hunters who book a hunt come home with a big bull. The big thing is the weather. If it's too warm or if you have a lot of rain, wind, etc, you will have a tough time. Again, that's just hunting. Weather in that part of Canada is very unpredictable. That's why most hunts are at least 10 days long.. It allows for the weather, delays in getting you in to your hunting area, etc. I was lucky on my hunt....there were no delays due to weather.
Regarding going within the next 5 years, I'd book a hunt asap. The prices go up every year. I hunted in 2014 with CSO and the all inclusive price was $12,500. That same hunt today is $16,000 plus licenses and plus the air charter of $1,650... You're looking at close to $20,000 for the hunt I paid $12,500 for just 4 years ago.
Good luck!!!!