I found that the Spark People tracker is enough for me and was a great price.
At one point I was looking into some of the ones that track sleep, but that feature isn't necessarily all it seems. I found a number of great articles that made me think twice about really tracking sleep via such devices as trackers.
You are on a good track, just keep looking at which devices have the features you want for the price you want and make sure the reviews give you confidence. Check reviews at various places to get a good mix.
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