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@Dammit
305 is pretty good, you can get it for very little on Amazon/eBay if you do a bit of digging.
Nice thing is that it has a bike mount also, so you can use it for rides with a GSC-10.
I like the nerdy uploading/checking out averages and maximums.
The 10K I did today or example- my heart rate averaged about 20 bpm above my last attempt at the same distance, and 10 above the one before that.