Heart Rate Monitors?

I am looking to buy one of those heart rate monitor watches but I'm a little torn as to which would be good for me. I want to be able to use it on my treadmill, during bosu workouts, workout DVDs, working out in a park, runs outside, hiking, lifting weights, etc. so it won't be used just for running. I'd like to know how many calories I am burning during these various exercises. That is my main goal in which watch I choose.

Anyone have a HRM watch? Love it? Hate it? Any recommendations? Thanks guys!!!

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