What heart rate monitor do you recommend?

I am going to purchase a heart rate monitor and I'm wondering what everyone else recommends. In addition, I want chest heart rate monitor to connect it with my iphone. What HRM do you recommend and why?
Thanks!!
Thanks!!
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Addidas, digifit, polar all have systems that work with the Iphone (don;t tell anyone but I;m one of those Mac owners and a bit of an apple nut)
ANT+ - Garmin etc. you will need a dongle to make it talk to an iPhone
Bluetooth - Wahoo Blue or the new Polar sensors - Talks directly to iPhone 4S onwards without a dongle.
Proprietary - Polar, only talks to polar head units.