Cheri,
If you have ever played with a Wii, you will know that it just responds to movement, not the intensity or the precision of the movement. Wii Fit is the same. You can get up and just kind of move around a little bit or you can really work out hard, but the Wii will respond the same. It's good for people who have a hard time getting off the couch at all, but that's not your problem so I wouldn't expect results if I were you.
I think your money would be better spent with a few lessons with a personal trainer. If you go to Lifetime Fitness, they can do metabolic testing for you and customize your workout. I worked out for years at the same pace as you - 5xs per week, 1-2 hour workouts and it ruined my metabolism. Your body adapts when you work out like that and don't know how to do it right. So I was working out hard and long. The heart rate monitor said I was burning 650-850 calories, but in reality my body was only burning 150-200 calories because I had become so efficient at it.
I know it seems logical that if you work out harder and longer and eat less and less, you will lose weight. It is more complicated than that. You have to know at what intensity level you burn fat and when you start to burn carbs. Do anything for too long and you lose your ability to burn at that level. Remember, for thousands of years, people have had to survive with very physically strenuous lifestyles and very limited amounts of food. People are physically designed to adapt and become more efficient for survival.
Good luck,
S.