On amazon the Garmin 410 with HRM is £5 less than the Nike+Sportwatch I don't know if the Nike has a HRM or can be hooked up to one?
I have treated myself to a Garmin 610 and apart from the touchscreen it's not much different to the 410, and I love it. I'd recommend Garmin to anyone. Just wake the watch up whilst your getting out of the car or strolling to your start point give it 30 seconds to find a satellite lock, and away you go.
EDIT: Big silly typo corrected.
Edited: 07/06/2012 at 16:58