Garmin 620 or 910xt - upgrade from a 310xt?

I'm considering getting the new Garmin 620 as my 310xt is currently driving me crazy where it locks up when I turn it on.... spends forever on the Garmin screen or the Off screen logo.... sometimes 20-30 minutes before it comes to life... 

Question is - should I wait for the 620 or just get the 910xt now?  I only use it for running...

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