If you have the space I would definitely purchase the squat stands. You can squat with the stands but not with the power tower. You can also do modified pull ups with the stands. The stands have a higher weight capacity than the power tower's maximum load of 100 lbs.
Regina
Do the stands take up that much space? Can't I move them to another room when I'm done the workout?
They don't take up much room at all. The base is only 20" x 20" and they are very easy to move. I always move mine up against the wall when I'm done using them.