Top 3 Stair Steppers. Buying a stair stepper is an asset to your fitness and an investment in your health, so you need to choose the best one for your goals and for your budget. Our favorite stair stepper is the Precor AMT100i Adaptive Motion Trainer which retails at the top of the range, around the three thousand mark. We have written a fully detailed review of the Precor AMT100i.