In reply to davkeo:
I've just made the exact same choice in the last week, replacing a Garmin 310XT so wanting to cover triathlon as well as your pursuits.
I went with Ambit3 Peak, on the basis of battery as you say, and the on line consensus seemed to say its GPS is more accurate. I also love the Suunto ability to show an animated 'birds eye' film of your route after the event; just a bit of fun..
I paid £229 on ebay for a new one, significantly cheaper than Fenix3 I think.