I personally have a Betta Fish. For me this is an ideal pet because it is a hardy little beast. I'll have had him for a year in October. Usually a fish lasts me...a week and a half tops. So am pleasantly amused by this little creature.
Don't let anyone fool you either. Fish are wonderful pets. They stay in one spot, and they're calming to watch. And they do change their behaviors over time. Mine now and then thinks that it is a piranha and tries to eat our fingers instead of its fish food.