ipod or mp3

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My supppperrrr old ipod nano finally died...cant get the thing to turn on at all anymore so now i want to try and purchase another one or something else. I just wanted to know what everyone else enjoys the best. I mainly use my music device solely for workout music....however, i also want to invest in a device that keeps track of my distance, pace and time for when i am running outside. They have HR monitor watches that also keep track of these items. But i have also heard that some ipods/mp3 with wifi have apps you can download to do this also.

So what do you all think is the best route here?