Want to invest in a HRM to assist in training for tris. I don't need something downloadable or with bike functions or that I can't get for under $150. I think I've narrowed it down to the Polar S210, Sports Instrument Pro 9, and the Sigma Sport PC15. Anyone have any experience with these models or have recommendations? I will definitely use it for cycling, spinning, and running and possibly swimming. I've done my thread search but did not come up with much on these models. Thanks.