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I think the main functional differences between the models are screen size (6.8in. 265dpi for the AuraHD, 6.0in. 212dpi for the Glo/Aura) and touch system (IR for the Glo and AuraHD, capacitive for the Aura).
The Aura and AuraHD have 4GB internal storage vs the Glo's 2GB, but don't let that sway you as it is quite easy to upgrade the internal storage on the Glo if that is important to you (I have 8GB in my Glo).
Early models of the Glo had a brighter light which some people found to be too bright. If that is a concern then beware that some places are still selling those early models. (I have an early model and am very happy with it, but I prefer the cooler white tone of the light to the warmer tone of the newer models).
If I had to replace my Glo today I would be tossing up between another Glo and the AuraHD.
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