Ask for an older, more experienced guide(s)
Go with Performance Tours, 1-800-328-7238. Ask for Creed as your guide. Great company.
You will get a bunch of recommendations, everything from River Runners to AVA. They are all good companies with good guides.
Wilderness Aware is a fine company. They tend to be more "By the Book". If that's your thing, then great. If not, go with Creed.
Everybody is about the same as far as safety.
You'll have a great time!