Lee, please tell us what types of water you are planning on using the tube. It makes a big difference if it is lake fishing vs rivers. For example, I bought an Outcast early in my tubing and found immediately that it was unstable for the faster rivers I float. Fortunately, I was able to take it back and trade it in for a round-type tube (Buck’s Bag, IMHO the best tube out there) and this is perfect for river floating. However, for lakes, many people like the bigger, open access Outcast type systems because you sit up off the water and have more mobility.
You mentioned Alpine lakes, if that is your goal, I think that the Fat Cat with a higher sitting platform would be a good choice and would be preferred over the donut style tubes.