Sport Watches

I want to use my itouch as one of the garmin watches with gps for runners but I have yet to find an application that that will let me do that, is there such a thing, will one come out soon or am I just asking for too much, and what would be the closest and best application for running, all suggestions are welcomed thanks!!!!

I’m thinking the Garmin Forerunner 305 but I want some other opinions.

I don’t actually know if it would be made specifically for running, but that’s what I want one for. It seems like one should be available. Maybe a Garmin or something?
Thanks

I’m lookin for a watch with the following features
* Step pase count
*Heart rate monitor
*Burns calories count per work out
*Heart rate alarm

I saw quite a few on Craigslist, that are much cheaper than buying new. Is there anything I should be wary of when buying used?