right now i want to buy a cardio machine for home and i'm between an elliptical and a stair stepper. i wanted an elliptical because i tore a lot of ligamits in my knee a while back, but i want the kind with the heart rate monitor built into the moving handles, and i have yet to see one. i'm thinking about the stair stepper just because they seem a lot more common and i would think as bonus they would build my legs up a little. what do yall think?