GPS/HRM HELP

I know most ppl only use a HRM on here but is any of my RUNNERS on here do anything with a GPS/HRM and if so what do you use and what do u think. My brother uses the new NIKE watch, I use android app RUNKEEPER (its free), looking at Timex IRONMAN, or the Garmin 410. I am looking at training up for a HALF IRONMAN next year so I need something that can be used in all 3 events. anyone have any input for me.