Someday I'll be able to post something that isn't the "polar" opposite of what everyone else seems to be suggesting
I had a Wahoo TICKR, and a Wahoo TICKR X. Fantastic HRM's. The TICKR X has additional features that really up it's ante, like internal memory that lets you use it without actually being connected to your device. I don't know how useful that is in our situations, but it was great during the training I did for my triathlon. It essentially turned my phone in a a top of the line Garmin. The TICKR's integrated with my phone seamlessly, and they were comfortable to boot. They "disappeared" after a minute of two.
So that's another option.