I bought a bare-bones model on Amazon that had pretty good reviews: This is the one I got for 35 dollars. I am a petite person, so I had trouble getting the chest strap to fit. No complaints if you only want to track your heart rate. It didn't do anything fancy like track calories, so eventually I upgraded to the Polar FT-7. I love it. It tracks calories and is able to tell you when you're in the fat-burning zone vs. the fitness zone during your workouts. It also keeps a log and charts of your progress. It's twice as much at 70 dollars.