Montrose to Ouray is a cakewalk, no problems at all. Our favorite is the Ouray KOA, been there several times. It sits in the woods and has a good campground feel. Try to get one of the back-in spots in the rear section of the campground, very quiet and peaceful. You can rent a Jeep right there in the campground and hit some of the trails. You should be there in the prime wildflower season and the Jeep with the top down is the way to go. Make your reservations now for the campground and the Jeep.
Even if you stay elsewhere be sure and go to little cafe at the KOA. Wednesday night and Saturday night they have great BBQ and live entertainment. Their breakfast is great and very reasonable. You do not have to stay there to eat at the cafe. IMO, breakfast is the best in the area.