I went with the Polar CS200cad, $149 from the LBS. Great features for the $$, exercise time, avg HR/max HR (you set your own limits for a workout zone if you want), time in/above/beow your "zone", kcalories burned, trip distance, avg speed/top speed, avg cadence/max cadence. Also has lap functions, odometer (can use on 2 bikes), time/date, stores prior workouts (8 total, I think). I love mine, no probs w/interference...only had to change the batt once.