In reply to stucknortherner:
check out the dcrainmaker site, he does some excellent reviews and points out the limitations, with wrist worn activity devices the HR functions tend to be a bit bad when actually doing strenuous activities, they are better paired with a strap or arm worn HR device, MIO do one and there is one called Rorsch i think that he reviews. One device that does look quite good is the Garmin FENIX 3 which does have HR but it ain't cheap at around £270 or so. I ended with a Garmin Vivosmart and I would recommend setting your own pace length if you want to track steps, it is also ANT+ and bluetooth smart so can pair with any 3rd party devices, I do have to stick it in my rucksack when hiking though as trekking poles skew the step count. It works fine with MyFitnessPal and syncs to my iphone, does the sleep tracking thing (never enough of that) and there is a web site log in where you can get much more detail and what you've been up to. I would suggest Garmin and Fitbit are probably leading the activity tracking market currently but it's pretty fluid and fast paced.